How do i do this on puter?

The trick to getting sketch up to really work for you is to learn how to use groups and layers. You need to separate different components into their own entity so they do not "stick" where you don't want them to. This is great software once you get the hang of how it works. Sadly, Google has hobbled the free version so printing and exporting is very hard.

Layers are handy for seperating complex structures from each other so you can view and work around with just the ones you have turned on.