Attach Test Coverage Matrix to be shared across all test caes?

Hi

Just started to use Zephyr Enterprise and have this question...

I like to design tests from a Test Coverage Matrix (TCM) (usually in Excel). Once I have mapped out my test coverage on the TCM I will create test cases for each scenario. Ideally, I would like to attach the TCM for reference at a level higher than Test Case so that each relevant test case has the TCM in common without me having to attach it to EVERY test case individually . However, it doesn't appear that you can attach a file to a flat folder in the Test Repository; you can only add sub-folders in which to create test cases. Any suggestions?