For the P4VickyGM mesh (head from DAZV2 & Body from Arduino's p4WWGv2. After importing into Poser 5 and converting into Cr2(using P4WWGv2's bone structure) it shows under Material with those groups from P4WWGv2 & groups identical to the body parts in the object mesh file. You are right only those body parts in the object mesh file show up in the Add Material pop-up in the Grouper Palette. Those from P4WWGv2 don't. Following Jaager's instruction, I am able to remove those "ghost" material groups from P4WWv2 by deleting the Material blocks in the CR2. Scroll all the way down almost to the end of the Cr2 and begin deleting from below the end of the IK Chain block - those that show Weld..." Now in the material room only those groups identical to the body parts in the mesh file shows up. You can delete "ghost" materials inherited from merging of different object files. Well I am still trying out to see how to assign materials in UV Mapper while waiting to see if PhilC has any other recommendation.