As described in Soil & Rock subsurfaces there is easy and powerful tools available to design subsurfaces in Novapoint.
How to export these TIN model to other target platforms?
The recommendation to use LandXML:
Activate the Output panel
Select the tool “Export to file”
Set a appropriate name and select a “Summary task”
Select Features to export (the subsurface(s))
Select target “File format”: LandXML
Set the “Conversion rule” to use “Default terraindata and alignment to LandXML_all surfaces”: