Merge RUI file in Rhino

Hello everyone,
I’m currently creating a menu for my plugin, and since I’m working with another partner, I don’t know if there’s a way for me to register 1 RUI and my partner also registers 1 RUI, but when loaded into one Rhino file, it will be merged. It will be combined into 1 menu.
Do you have any ideas?
Thank you in advance