Player Expertise Product / Player Expertise Product Change

[learn42day]

I'm experimenting with player product expertise. Can a player only have 1 product class expertise? It seems like a player can only have 1 product expertise or 2 if you have digital dlc. Is it possible to get multiple expertise with sub goals? For instance have:
//--------------------------------------------------------------//
[PLAYER EXPERTISE]
Product Expertise = Apparel, 100
//--------------------------------------------------------------//
[SUBGOAL]
// define X
[SUBGOAL VALUE]
// define value
[SUBGOAL REWARDS]
player expertise change = Electronic Products, 100
//--------------------------------------------------------------//
Would this override the apparel or give the player an additional expertise?