How do you make a new item / geometry from a selection

[micheus]

Hi wing_it_d3, welcome to our community.

To make a new item from a geometry selection you can use (in Face mode [F]) the command Extract.

That will not "open" a hole in the source object. Wings works with closed manifolds, so in order to get that effect you have two options depending on what you want to achieve:
- Hole: it will open a hole in your geometry, but you cannot work in the inner side of it, because you will be only seeing the backfaces of the remaining faces of the object/mesh;
- Intrude: it will allow you to define a thickness to the object and it will create the inner faces.

Try yourself to understand the differences.

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Obs: You can make this kind of question in the Interface & Usage session ok. I'm moving this one to there as soon as you answer it.