Connects and disconnects a pipe support to another support.
 Ribbon: Home tab 
 Pipe Supports panel 
 Supports on SupportsConnected pipe supports are grouped in the model and the isometric drawing, but are separate items in the isometric bill-of-material.
 Command entry: 
plantsupportsonsupports

Select pipe supports to connect together or [Disconnect]: Select 2 or more pipe supports.
If you are connecting pipe supports, at least one pipe support must be attached to piping.
Disconnects pipe supports that were previously connected.