Do you mean a single fitting supporting multiple pipes at once or a fitting that is used by different specifications?
I have no idea for the former, while the latter is quite simple: just enter the support in the asfiles for each pipe spec. The same support can be used by multiple specs.
So in real life you use supports that can hold multiple pipelines.
And you want to model this in Spec Driven Piping, using the same instance of a support fitting for several pipe segments (from different pipelines), right?
Spec Driven Piping is not my specialty, but I can imagine that this is difficult to handle from the logic in the program...
Thanks for your answer. I have now try to find alternative solution, beacuse we have branch of pipes and we need to show common support for different pipe lines.