I don't know how over people do it but this is the way I do.  1. Find the superstar I wish to change I.e Justin Gabriel his PAC of old is ch327.pac 2. so I go to wwe 2k15 find 327 and name him 327_Justin.PAC so can find him if needed.  3. I make acopy of him and move him to wwe 2k 16 pac CH folder.  4. I then go to pozzums table and find Justin Gabriel ported space and rename his PAC from 327 to ch47902.PAC you can inject into other PAC files I just use the rename feature.  5. Open the file with