Looking for some advice on notching film that I cutting down.

I have a 7x11 camera (and holders etc...) that I would like to start shooting wi th. I plan to get some 11x14 film and cutting it in half in order to make 7x11 f ilm. What I am looking for is some good suggestions on how I might be able to no tch the film so that I can pre-cut film prior to loading into holders... or to t ake with me on extended travel.

Your inputs are greatly appreciated!

Steve