Removing lines

I used only ready-made models. I am making a model of a doll house for my daughter. House on 3 floors with a terrace and a veranda. But how to do it ... I decided to create a number of rectangles, merge them, delete unnecessary lines, after all the vectors merge and go to cut ... but the eraser does not delete, but adds vectors and instead of deleting the line, a double line is obtained. Please tell me either what to do, or a tutorial for training ...

sorry for my english

  • I decided to create a number of rectangles, merge them, delete unnecessary lines

    When you say "merge" do you mean "combine"?

    If you create a bunch of rectangles and then Weld (Object > Shaping > Weld) them together instead, there shouldn't be any "unnecessary" lines to remove.
    You can also use Boundary (same menu as Weld) to create a "cut line" around selected objects.

    Not sure this was what you asked for. If not, please give us some more details.