Hello Steve,
This will be fixed with the SP2 of Advance Steel 2011 (planned to be released in November 2011).
The current workaround is:
- create the "Clip angle" joint and ask for two angles (choose "double" for the option "1. Number of angles" in the dialog)
- select the joint cuboid and delete it (to stop the intelligence of the automatic joint)
- select the unwanted angle and the bolts between it and the main beam, and delete them
Regards
Philippe