GGraCHCH
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let's say there's a mod by Zahara, it has a folder called MapObjects\_(AdvMapSharedGroup)\Monsters, and inside it are files corresponding to different levels. These are lists, and the data.pak file also contains these files; you can take them from there.
in these files, there are lists, so you need to add lines and specify the files of your NCF units.
Added 1 minute ago
but be careful, some structures must remain constant.
#xpointer(/AdvMapMonsterShared)"/>
Another question: if I download some pack but just delete the files of the creatures I don't need, will the game break?