I have an Igs file of a die assembly. I want to make an animation of the Die's molding process in SolidWorks. How can I select and edit the parts of this assembly individually?

I have an Igs file of a die assembly made in CATIA originally. I have just igs file now, but I want to make an animation of the Die's molding process in SolidWorks. How can I do this, I'm unable to even selects the parts of this assembly individually. How can I select/ edit this assembly's parts?