Thanks I have the advanced editing tool installed
my question is about a measurement that cannot be derived from the dimension of an object eg the measurement between 2 opposing walls across 2 rooms, where the is no single wall .
If I read you correctly to create a particular measurement between two objects on the plan I would need to create an object either furniture or a room of that particular size, the create the dimension measurement from that and copy that into the design at the correct location ?