Hi,

This can be done in the ABT tool, within the Building > Building Structure Section, via drag and drop.

Once in the Building Structure tree-view, you need to change the view to display as 'Room View' (rather than the default AS view).

In this view, think of each 'room' as being a DXR. If you expand the room in the tree-view, the associated room segment should appear. You can then drag and drop room segments from one 'room' to another.

The 'room' with multiple segments becomes the Master. The 'room' with no segments becomes the Slave. Hope that all makes sense.

Any DXRs that are affected by changes you make need to be downloaded. 

Regards,