How to choose between several models-[PickMaster 3.44]

Hi.
Im developing a HMI with VS and im having some issues trying to choose which pattern I want the robot to pick.
I have just 3 items but about 250 models to use. How could i do it ? I thought i could use an UserHook to solve my problem but i dont really know how i should do it.

Thanks for your time.