Trouble with Project Usages

Hi everyone.

So I'm new to using Project Usages, and I think I have made a mistake that I need to rectify. I have to separate projects that I've made. Project A has Project Usages from Project B.  I ended up building a new version of Project B, and instead of going through the correct process of removing the project usages for Project B via the Project Usages dialog, I just deleted it from the containment tree and imported the new version of Project B.

This had the result of breaking the dependencies between Project A and Project B, and now I'm at a loss as to how to re-establish those connections.

Any help on this would be appreciated! 

Thanks!