Inserting a assembly into another assembly

Hello i am moddeling a mousetrap car in solidworks, first i made the mousetrap and saved it as a assembly. after that i started moddeling the car. when i was finished i made a new assembly for the whole car in wich i inserted the previously made assembly of the mousetrap. In this assembly i cant move the parts of the mousetrap anymore. Is there any way i can make the mousetrap assembly "move-able" instead of having to assemble both the mousetrap and the car in one assembly.

excuse me for my bad english, it is not my native language

SolidworksAssemblies