Trimble Business Center

Hi,

In trimble business centre how would you go about extracting a close polygon from an edge of a solid?

I've been given road pavements as solid models need to create surfaces for underside of pavements

I've been able to use the TBC macro Explode IFC Shell to seperate by surface face direction which was given all the lines that define that as exploded. But to join the boundary I'll to isolate manually the boundary strings

In the past I've used other programs to create surfaces, then extract a boundary string straight from the surface. Can't seem to find that button