Hello Fabrice! Sorry to hear things aren’t going well… There is a learning curve, but once you get it ConDoc is simply “the way you use sketchup”. Have you looked at our Model Organization Guides on the 3d warehouse? These have all of the groups nested and layered already.
Have you considered a 3d helpline? We charge $100/hour for premium support. We do a screenshare to either fix your file, or explain how you can move forward.
If you send me your file I can take a look and let you know where you went wrong… [email protected].