SLC500 - Combine programs

What would be the easiest way to transfer a portion of a SLC500 program to another SLC500 processor (assuming they hav same version#)? The second processor already has a program, but I need to combine the logic without I/O conflicts, of course. Anyone have any advice on importing a .slc library and using the "Indexing" mode? I need to understand what happens to relative addressing conflicts. Thanks in advance.

Program/portion which you gonna transfer:
1. Copy it to a new file in the program.
2. It that file find&replace: all B,N,T,F,C to the area which is free in the target SLC Program. (Tip: don't work with the bits, work with the words). I&O replace manually according to spear IO on the target program. When done, copy&paste.
I hope this is the easiest way.