after polypainting, not posible apply differents textures to diferents subtool
Aurick give a tips but i ´ve the same problem like anotgher guy, i can try the tips of Aurick withe 3.11 windows: seehere
If after using the UV Groups option your model still has only one polygroup then your UV’s are not laid out in multiple shells/spaces. (This is common with Poser models, which use overlapping UV’s instead of multiple spaces.) You will have to manually break the model apart into the necessary SubTools.