What should i do to keep the folders_common_a and folders_common_b seperate and link them into the subfolders.

I'm using Altium Designer for PCB design and I'd like to have a folder particular folder structure setup.

Folder_common_a and Folder_common_b will be common to all subfolders of Template. They will always contain the exact same files and folders. They will include necessary files that are required for any project. Sure I can just create a copy, but if I were to change something or add something in those folders, then I would need to recopy those folders into every subfolder. Right now its ok, but this list will grow and it becomes more of a pain to actually do it that way.

What I would like is to keep the folders_common_a and folders_common_b seperate and link them into the subfolders. I'm fairly new to the SVN, any way I can get link a repo to another repo, so that when I checkout the templates, I also checkout the common folder repo as well ?