So, I am new to SketchUp, and I an definitely not a professional, so I need some help. I was recently making a house for my I.T project and I got stuck with layers. When I was making my base layer, I left out a chunk of wall by accident. Because of this, the wall is not included in the layer, and I do not know how I can redo the layer again. I tried back spacing but it will not work. Also, I make a copy of the house to see if that would do anything, but everything stays on layer zero. So, basically, I want to make a new ‘base layer,’ but on my original house plan, I left out a chunk of wall, and on the copy, I can not make a new layer since everything is still on layer zero. Do any of you have any suggestions? I do not really understand all of this professional architecture stuff either. I have only just started using it! Please help!