[Therion] Cavesystem - Addition of cavelenght

Dear all, I want to make a plan, which includes three caves. But how is it possible that the cavelenght is only added from one Cave-centerline. For example: Cave1 = 100m Cave2 = 2000m Cave3 = 50m The best would be if I will get following Header: Name of cave2 Scalebar and northarrow Name of cave1 with there length Name of cave3 with there length Length of cave2 Depth of cave2 And so on.... Thank you for getting a reply. Markus