I tried that but once in the GPS workbench CATIA sees the split surfaces as individual surfaces (not joined). In the first example I tried I took a rectangular surface and split a circle in the center (without using the Datum icon). When meshing I had to mesh each surface individually. Next I...
If I understand you correctly you can't apply boundary conditions because when you try to add loads, or restraints or .... the whole surface\volume gets pick.
Or am I totally of?
Try splitting the surface into areas where you want to apply your BCs. When you do the Split, select the Datum icon...
What I meant was sketching the lines first using the Line or Profile icon, constrain them using Geometrical Constraints or Driving Dimensions then "tracing" over them when creating the section line.
Use the right mouse button for additional options when sketching the section line.
Creating the circular reference (in Pro/E anyways) is no problem. Sometimes they can get created without intending to. I ran into this a lot using Pro/MOLD.
I found the models I worked with that had circular references were unstable. PTC always told us to fix them.
Do know much about VB but my best guess is the CATScript file it creates can be modified to run and change the desired settings (instead of going to Tools, Options to do it).
This can be useful if you change settings often. No need to go to Tools, Options just run the script.
The link below takes you to IBM PLM Support.
https://www-304.ibm.com/jct03004c/software/applications/plm/support/support.wss
You can search for stuff under Self help or submit defects under Problem submission.
Sorry couldn’t be more help, we’re not on R15.