Muhammad,
Yes, you can create another common division for P1 and P2 e.g. PZ
So, during sales order creation, in the initial screen user will give PZ division (along with order type, and sales org, dis channel). Is that the way?
If manually user is giving PZ, then keep only 1 common division P0 and with user discipline, let user not make the mistake of giving the materials with P3, where not required.
Point is don't handle this from SAP but let user training be the way forward.
TW