Hi Robert,
I think that you’ll find this is quite a common one, perhaps try a few forum searches.
If you install the BVN package, you’ll see a node called Door.RenumberByRoom this may well do what you want.
If not, try double clicking to open the node and have a look at how it works, you may well be able to copy parts into your main graph to create your own version.
My version can be found here…
Door Number by Linked Room - Clockwise from Entrance Door
Hope that’s helpful,
Mark