How do I move iTunes files off of my MB Pro to Time Capsule in order to make space but not lose the files permanently??

Just set up my Time Capsule and did the big overnight backup. I am running Leopard and need to upgrade, so I wanted to back everything up before upgrading. In this process I discovered that I only have 16.14 GB available out of the 297.7 GB capacity. I believe that having a bunch of movies and TV shows (many of which are HD) are what caused me to eat up so much memory.

I want to move all of these movies and TV shows off of my MacBook Pro but on to my Time Capsule so I can access them later if I want to. I looked in the Help section but couldn't find info relating to this specific desire. Any guidance would be greatly appreciated.