I read this topic before posting: https://discourse.mcneel.com/t/addsrfsectioncrvs/89905
Helvetosaur mentions here that AddSrfSectionCrvs is only in RhinoScript and not accessible thru Python.
My understanding is that calling RhinoScript methods thru Excel VBA is basically the same as calling it within RhinoScript itself. Thus, there should not be any problem calling the method from Excel VBA?