Including resources from external projects in xcode

Question

I want to use components and functionality from an external project in a new iPhone project.

I am able to add external projects using "Add >> Existing Files...". At build time however, resources such as images are not copied into the build from the external project, however the .h and .m files are. Do I need to add something specific to the linker settings?

I am using Xcode 3.2.3.