If I understand correctly you don't actually work on the 3D model itself but on a separate worksheet where you created a 2D views from the 3D model and then you add the lines you need. I meantt the ability to actually keep 2D lines in the 3D view. Could someone actually have a look at a model I have worked on? because if it is actually possible I am missing something big.
UPDATE: I attach a view of the Floor Plan (where I work with both 2d and 3D objects): I would like everything to show up in the axo view (seconnd image) so I can see the 2D plan in the 3D view. At this stage the post shoudld be moved to another Noticeboard.
AC26 EDU • WIN 10 • Intel Core i7 2.8 GHz• 32G RAM• NVidia GForce GTX 1080