check out
http://archicad-talk.graphisoft.com/viewtopic.php?p=262390&sid=93235e06f0f760132e368afd0f70bc2a The Electrogon tool may play with the Trunking object you're using.
Note promise from Graphisoft......still waiting
ILIFFE ARCHITECTURAL
BRITISH COLUMBIA
macbook pro 2.7 GHz Intel Core i7 8 GB 1600 MHz DDR3 NVIDIA GeForce GT 650M 1024 MB
AC 21 USA (latest build)