I've updated the request tool to allow you to link requests once they are created (I realize you'll probably want to do this from creation, but I'll come back around to that later). If you view a request there is a new button at the top called 'Link Request'. You can type in the text box and search the titles and types of your recent requests, or just enter the id of the request you want to link.
Let me know if you see any issues.