public class ClientPortfolioDetailsBean 
{
	//Domain model for the client portfolio details
	
	//Portfolio level attributes
	private String investorName = null;
	private String emailId = null;
	private String contactNumber = null;
	//..... Other portfolio level attributes
	//List to hold the details of Stocks / Mutual Funds etc investment category 
	private List <InvestmentCategoryDetailsBean> invCategoryList = null;
}
public class InvestmentCategoryDetailsBean {
	
	//Bean to hold the information about investment category details
	//like Stocks, Mutual Funds etc. Represents the first level rows
	private String categoryName = null;
	private double targetInvstAmt  = 0.0;
	private double expectedAnnualReturn   = 0.0;
	//Other attributes follows 
	//List of stocks and fund details bean to hold the 
	//second level items 
	private List <StocksAndFundDetailsBean> itemList = null;
}
public class StocksAndFundDetailsBean {
	
	//Bean to hold the information about investment category details
	//like Stocks, Mutual Funds etc. Represents the second level rows
	
	//Attributes at that level
	private String stockFundCategoryName = null;
	private double targetInvstAmt = 0.0;
	private double targetProfit =0.0;
	//Other attribute follows
	//List to hold the stock details 
	private List <StocksDetailsBean> stockDetailsList = null;
}
public class StocksDetailsBean {
	
	//Represents the third level item details
	//Details of individual stock/fund details
	private String stockFundName = null;
	private double noOfStocks = 0.0;
	private double buyingPrice =0.0;
	private Date buyingDate = null;
}

public class PortfolioDetailsBean extends ActionForm

{

	//Top level attributes 
	
	private String investorName = null;
	private String emailId = null;
	//........... Other Top level attributes 
	
	//Fields to capture Attributes of First level rows 
	private double[] firstLevelTargetAmt = null;
	private double[] firstLevelExpectedAnnlReturn = null;
	//......... Other First Level row attributes

	//Fields to capture Attributes of Second level rows 
	private double[] secondLevelTargetAmt = null;
	private double[] secondLevelTargetInvPeriod = null;
	//......... Other Second level row attributes

	//Fields to capture Attributes of Second level rows 
	private double[] thirdLevelNoOfStocks = null;
	private double[] thirdLevelByingPrice = null;
	//......... Other Third level row attributes
}

public class UpdatePortfolioAction extends Action

{

    public ActionForward execute(ActionMapping mapping, ActionForm form,
	    HttpServletRequest request, HttpServletResponse response)
	    throws Exception {

	ActionErrors errors = new ActionErrors();
	ActionForward forward = new ActionForward(); // return value
	PortfolioDetailsBean portfolioDetailsBean = (PortfolioDetailsBean) form;

	
	try {
		//Counter to track index of 2nd level index
		int counter2ndLevelIndex= 0;
		//Converting the form bean to the domain model 
		ClientPortfolioDetailsBean clientBean = new ClientPortfolioDetailsBean();
		//Setting the top level attributes 
		clientBean.setEmailId(portfolioDetailsBean.getEmailId());
		//.........................................
		//Similarly other top level fields are created 
		//Get the size of first level row sizes from session
		int sizeInvestmentCategory = getInvestmentCategorySize
           (request.getSession());
		clientBean.setInvCategoryList(new ArrayList
           <InvestmentCategoryDetailsBean>(sizeInvestmentCategory));
		for(int firstLevelIndex=0;firstLevelIndex<
           sizeInvestmentCategory;firstLevelIndex++)
		{
			//Create the updated first level bean
			InvestmentCategoryDetailsBean invCatBean = 
               new InvestmentCategoryDetailsBean();
			//Set the investment category Bean in the parent bean
			clientBean.getInvCategoryList().add(invCatBean);
			//set the updated properties 
			invCatBean.setExpectedAnnualReturn(
               portfolioDetailsBean.getFirstLevelExpectedAnnlReturn()[firstLevelIndex]);
			//.........................................
			//Set the other properties at first level 
			//Get the size of 2nd level row sizes from session
	        int sizeStockAndFundDetails = getStockAndFundDetailsSize
               (request.getSession(),firstLevelIndex);
              	invCatBean.setItemList(
                     new ArrayList<StocksAndFundDetailsBean>(sizeStockAndFundDetails));
			//Fill Up the second level objects
	        for(int secondLevelIndex=0;secondLevelIndex<
               sizeStockAndFundDetails;secondLevelIndex++)
			{
	StocksAndFundDetailsBean stkFundDetails = 
	   new StocksAndFundDetailsBean();
    //Set the object to the parent Bean
    invCatBean.getItemList().add(stkFundDetails);
    //Set the individual attributes 
	stkFundDetails.setTargetInvstAmt(
       portfolioDetailsBean.getSecondLevelTargetAmt()[counter2ndLevelIndex++]);
       //............... Other fields follows
	   // Setting up of 3rd level list follows here
	   //......................................
	}			
   }		
} catch (Exception e) {

   // Report the error using the appropriate name and ID.

   }
}

public class ClientPortfolioAction extends ActionSupport {

	private ClientPortfolioDetailsBean clientDetailsBean = null;
		
	//Accessor for the clientDetailsBean. 
	public ClientPortfolioDetailsBean getClientDetailsBean() {
		if(clientDetailsBean==null)
		{
			//If the bean is null for this action class instance
			//load the data from the session 
			clientDetailsBean = getClientDetailsFromSession();
		}
		return clientDetailsBean;
	}
}

<%@ taglib prefix="s" uri="/struts-tags" %>

	<s:textfield name="clientDetailsBean.investorName" 
value="%{clientDetailsBean.investorName}"/%>
	<s:textfield name="clientDetailsBean.emailId" 
value="%{clientDetailsBean.emailId}"/%>
	<s:textfield name="clientDetailsBean.contactNumber" 
value="%{clientDetailsBean.contactNumber}"/%>
		
	<s:iterator value="clientDetailsBean.invCategoryList" 
var="invCatDetails" status="firstLevelIdx"%>
		 
		<s:property value="%{#invCatDetails.categoryName}"/%>
		 
	<s:textfield name="clientDetailsBean[%{#firstLevelIdx.index}]
.targetInvstAmt" 
value="%{invCatDetails.targetInvstAmt}"/%>
								
<s:textfield name="clientDetailsBean[%{#firstLevelIdx.index}]
.expectedAnnualReturn" 
value="{invCatDetails.expectedAnnualReturn}"/%>
											
			<s:iterator value="#invCatDetails.itemList"
var="stkFundDetails" status="secondLevelIndx"%>
				
			<s:property value="%{#stkFundDetails.
stockFundCategoryName}"/%>
	<s:textfield name="clientDetailsBean
[%{#firstLevelIdx.index}].itemList[%{secondLevelIndx.index}].
targetInvstAmt" value="%{#stkFundDetails.targetInvstAmt}" /%>
	<s:textfield name="clientDetailsBean[%{#firstLevelIdx.index}]
.itemList[%{secondLevelIndx.index}].
targetProfit" value="%{#stkFundDetails.targetProfit}" /%>
											
	<s:iterator value="#stkFundDetails.stockDetailsList" 
var="stkDetails" status="thirdLevelIndx"%>
	<s:property value="%{stkDetails.stockFundName}" /%>
	<s:textfield name="clientDetailsBean[%{#firstLevelIdx.index}]
.itemList[%{secondLevelIndx.index}].stockDetailsList
[%{thirdLevelIndx.index}].noOfStocks" value="%{#stkDetails.noOfStocks}" /%>
	<s:textfield name="clientDetailsBean[%{#firstLevelIdx.index}]
.itemList[%{secondLevelIndx.index}].stockDetailsList
[%{thirdLevelIndx.index}].buyingPrice" value="%{#stkDetails.buyingPrice}"/%>
					
				</s:iterator>				
			</s:iterator>
		
	</s:iterator>

                <s:textfield
                name="clientDetailsBean[%{#firstLevelIdx.index}]
                .itemList[%{secondLevelIndx.index}].stockDetailsList
                [%thirdLevelIndx.index}].noOfStocks}'/>

<input type="text"
                name="clientDetailsBean[0].itemList[0].stockDetailsList[0].noOfStocks"
                value="<somevalue>" />