The Manual Mapping view
After hardware resolution is complete, there are no red-circled Xs in either the Hardware Resolution or Channel Type Summary panes of the Hardware Resolution view. Manual Mapping then becomes available. Figure 1 shows Manual Mapping available in the bar of buttons in the top of the tool.
The Hardware ->I/O format conceptualizes the workflow from the hardware point of view. After you select a hardware port, the tool filters the list of available CHPIDs based on your choice; then and you select the CHPID or CHPIDs. Alternately, the I/O -> Hardware format allows you to select a particular CHPID; the tool filters the hardware, and you select the location to assign to the CHPID.
Clicking Manual Mapping has the same effect as clicking Manual Mapping > Hardware -> I/O.