New categories iProcurement

Hello,

I need some informations about creating new categories in iProcurement (iProc)

Until now, the categories un iProc are  an extraction from our Purchasing - Inventory modules.

Now we want ot create new categories more specific for iProc users.    We want to associate items numbers from inventory to new iProc categories.

Is there a way in iProc to assign items diretly in e-content responsability?

Or do we have to create other Inventory categories and then extract them in iProc?

Thanks!