Including Repo in new Repo?

Hi I’m new Github and just having a play and was wondering if anyone could point me in the right direction. I’ve got two repo’s

and I would like to create a new repo that includes the two, and updates files from the original, but does not add new ones created in the new project.

Any ideas?

Submodules are pretty close to what you describe, they basically let you link a repository into another as a subdirectory. See: Git - Submodules