Hello, in advance i thank you for opinions and help 
Lets say : I have simple model with 2 walls. One is concrete (XX) and one is light from plaster board (YY). I have same parameter for all items of this cathegory, In data standard from client should be in walls parameter Material. In case of XX in P set called P_S25 and in case of YY in Pset P_S3. Okey, I use mapping text file for mapping to IFC and i specify groups as IFC wall, but it creates both P sets with same content (duplicates information). Is that any way or more detailed cathegorization of individual sub cathegory or individual walls in mapping process? Way how to split two items of same cathegory to 2 different P sets? Without using 2 different parameters.
Thank you very much
Best regards
Jiri