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Yeah, that's not so hard. Can you upload a dwg example, so we know what we're counting? And how we know which block is in which room...

Ah, it might be (vla-get-textstring at1) that you need to use (and (vla-get-textstring at2) instead of TextString

Forums/autodesk has a CIV3D forum it may be worth asking there also. A lot of smart CIV3D people.

This is the proper topic for everything related to Civil 3D. Welcome to CAD Tutor! I'm almost certain you'd have to write some code to do what you want, because you'd have to check for matching inverts. I don't think the labeling system is smart enough to do that, since it processes only one pipe at a time. In effect you'd have to rewrite the labeling system just to get one tweak. The brute force approach would be to define a similar style that combines both directions, but if either of the inverts changed, the label wouldn't reflect that. You'd have to constantly check the inverts to see if you should revert to the original style. There's probably some kind of expression magic to do this, but I'm not good enough at programming to figure it out. You might be able to check two adjacent pipe components and combine their directions. Here's a trick for doing something like that, just to give you an idea of how you can do this type of thing.