@cuddlebunny said: What i did before was to make the walls on layer 0 then group them send them to their layer and when i need to work on the walls i`d have the wall layer active and visible and draw the lines on that wall layer, i see now that was my problem. Yes. That is the problem. @cuddlebunny said: If i understand right, when i need to work on my wall group thats on is on the wall layer i must make sure layer 0 is active with the wall layer visible and draw all lines in the 0 layer. Really the thing to do is leave Layer 0 active at all times. If you need to edit your wall group which is on the Wall layer, you'll open the group for editing and make the needed changes. At that point you'll be working on Layer 0 where all the other geometry is. As layers and visibility are concerned, I often use the analogy of the cloaking device on the Romulan Bird of Prey spaceship. (Did you ever watch the original Star Trek series?) The Romulans would activate the cloaking device which would make the ship invisible. It would still be there but it couldn't be seen. In the same way, turning off the visibility of a layer associated with a group or component cloaks the edges and faces inside. @cuddlebunny said: Thank you Dave for taking your time to explain this to me hopefully now i can finish my first model. You're welcome.