If anyone is using Atmel6 Studio, can you tell me please if there is a way to specify include paths in a project?

All real compilers fundamentally let you specify a path to external directories to access libraries you may have that you want to link in, but you don't want to create copies of (those files) within the local project. You do it once in the project settings, or global compiler settings, and if the compiler can't find a source or header or library file via relative path (from #include), it will check there to see if the file being referenced is found.

This lets you use the same libraries across multiple projects without creating endless copies of the library files.

Nevermind, I found the answer. You can't. They used this silly dialogue driven method for each and every external non-compiler library you wish to include that was obviously designed by a non-coder.