Yesterday evening, I found some time to play with your codes. I realized, that you have a problem, I described yesterday. Therion has only one station naming syntax - it does no difference between centerline imported from .3d files and .th centerline. To get all your stuff work together, I needed to do just a very simple thing. I modified your benarat_only.th file very dirty way: survey benarat -title "Benarat Mountain, Northern Section" import benarat.3d -surveys use import benarat.3d -surveys create input benarat.th endsurvey benarat First import will create davids.a15@benarat stations, the second one a15@davids.benarat stations. In this case, all centerline is imported twice, but it works! To get it working correct way - you need only "-surveys use" version of import command, but then you need to create missing sub-surveys in your terikan data. You can download my version of your data at: http://therion.speleo.sk/upload/Benarat.zip I hope, this will help you. S.