[Therion] Loop in survey, how to split the extended view on a specific station ?

Hello, On a cave, when you have a cave with gallery witch interconnect, and you do loops in your survey. For plan survey, no problems, but for extended view, you have to split on gallery or an other because the lenght of the 2 gallerys is not the same. Therion split automatically the extended survey (we can see it on the xvi file), but, can we tell the software in which point we want to split the survey ? can you change the split point ? where ? Thanks, Gilbert