This is a quick fix for Off Page Connector in AutoCAD P&ID 2014 and 2015 (Free BSD License)
To use this
- Copy Lazcad.Opc.bundle folder into C:\ProgramData\Autodesk\ApplicationPlugins
- Open AutoCAD P&ID and enter "OPCSELECT" command. You can pick the first Off page connector
- Go to the other drawing and enter "OPCSELECT" command again, it will ask you to select the second connector. Select to finish the command