If an operation contains four NC sequences, and you selected sequences 1 and 3 for subroutine patterning with number of instances equal to two, the output will look like this:

If Incremental is selected, the system outputs two additional commands, MODE/INCR and MODE/ABSOL, for each NC sequence that is placed in a subroutine. This triggers the post processor to process and output the data as incremental moves (the output in the subroutine is still absolute):