Need help separating objects



Hello, I’m new to SketchUp, I am currently using it for free. I’m drawing a simple object and I need help for this problem:

I make two lines inside of an another object in order to make a thing like a barrier, when I pull it up it goes like this:

But instead I want it to become a separated object, so it won’t interact with the other face. It should be like a barrier inside that object. How can I do that?


Draw one side at a time and make it a component or group before you draw the other side.

What exactly is this thing supposed to be?


Press Ctrl when you pull it up. And later, don’t forget to erase the bottom lines.