Nope, believe me I have looked for a way since program inception as for elbows C1 SHOULD be the entering size and C2 the leaving size and there's no need for C3 as the seam between gores should come from SEAMS NOT from connectors, this has bugged us in writing specs since day one! I guess that the original programmers though that connection between gores should be a connector.
We found out really quick when starting this travel on a FLANGED job, we had an extraordinary amount of extra flanges, after inspection we found ALL elbows on the job had FLANGES between the gores, so nowadays we LOCK C1 to a SEAM...
