How can I view models which exist in other projects?

I'm working in Catia V5. I currently have two Grabcad projects and use parts from one project in the other. In Catia, the assembly is displayed correctly. However, in the viewer, I get a message saying '36 dependent files not found' and so the assembly is only partially displayed. Do I have to have a copy of a part in every project which uses it?
Thanks

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