I wish to change the value of a variable in VBA and display its current value
in the document body. i.e. "Room <RoomVar> master controls" where <RoomVar>
changes at the push of a Button or ToggleButton.

I can declare and manage a variable in VBA but I don't know how to reference
it in the document text.
I can set up a File>Properties>Custom>Add value which I can reference in the
text, but I don't know how to reference it in VBA.

Any of the two will do. Please help.