This page allows you to fine tune the interface mapping for the merge process.
The interfaces will be automatically pre-mapped by the selection on the previous page, with all available target interfaces listed at the bottom.
If you want you can use the pop-up menu on the target interface list to add arbitrary interfaces. Target interfaces can also be edited or removed from the list, unless it is an interface that was found while scanning the source files (when origin is "From File").
Mapping interfaces is performed by selecting the existing interface in the upper list and then selecting a target interface in the lower list.