Merging two projects into one at the same site

We have two TrapNZ predator control project running at the same site. The boundary has been extended so we now have two TrapNZ projects. It would make sense that we merge the two and just have the one Project site. Is there a simple way to do this? I could do with step by step instructions if someone could explain how to do this please.

@bluemountains sent to the help desk

I have created a help doc in the Comprehensive user guide for this