Functional group control numbers

Each functional group that is contained within an interchange also has a control number. Here, you can assign the functional group a control number that is independent from the interchange control number. This technique tracks functional groups independently from the interchange they are contained in.

For example, you might set up one set, or a range of sets, of unique functional group control numbers for #850s and another for #856s.

You can also choose to start at the value 1 and increment by 1 within an interchange. You would therefore be able to track functional groups relative to the interchange in which they were contained. For example, the fifth functional group within interchange number 100 might be uniquely tracked.