What do i have to keep in Mind when editing popgroups.ymt and vehiclemodelsets.meta ?

[Chris W.]

Hey Guys,
i want to modify both Files mentioned in the Topic a bit to my liking, like adding the Insurgent to Army Group, adding more Cars to certain Gangs and to enlarge some Vehicle Groups.
I know that the Game tends to crash when for example the VEH_POOR has added too many Cars.
Im not talking about Custom Content Cars,i mean the regular Ingame Cars or Cars from new DLCs.
I think i need to edit the gamesconfig too somehow,but which Values need to be edited so i can raise the number of different Cars in a VEH Group?
Anyone can me enlighten on this?

[NeulandInternet]

What you also can do, is to make a new VEH_GROUP in the popgroups.ymt containing your desired cars.