I have been using UG/NX since V18, this was always an issue. My workaround, move the view with the section lines to a seperate sheet. Use 2D Exchange and export the view to an empty NX part. Open the new part, position the view with a feature of the view @ absolute 0,0,0(defining feature of view). Delete all entities except for the section lines, arrows, and letters. Save part.
Go back to the original drawing move your view back to its original sheet. Now copy that view into the new sheet. The secttion lines will not be there. Now import the part with only the section lines that you created. And pick the origin on the new view the exact same as the one used as the defining feature as noted above. I've used this on drawings where the main view had 20 sections dependant on it. It works perfectly every time. Only issue is the new section lines are not associative.
Rob