Moving a C3D project from one directory to another

I do keep all the models, textures etc of my C4D scene in one directory. In the final form of my C4D scene, some of the models and textures are no more required.

How can I export the final scene to a new directory so that ONLY used etities are copied?

Would you recommend from your experience a better practice of organizing, storing models, textures, etc?

Thanks,

Roberto Hawkowski