Why does combine leave behind a copy of the target body?

[matrixofdyna]

Here is what I start with:

When I combine this as follows:

I get a new component as expected, but a body gets left behind as well. This happens to be the original target body selected in the Combine GUI options:

Now my question is, why does this happen? I can't delete that original body since I get a message that "deletion causes downstream feature failure". Why?

[davebYYPCU]

Because you ticked new component.  Untick the option, you will get what you expect.

Body 3 belongs to a top level sketch.

Might help….

[matrixofdyna]

What I mean is, when I click new component, all the bodies should be combined into an actual new component and a copy should not be left behind.

[jhackney1972]

Please attach your model for analysis.  If you do not know how to attach your Fusion 360 model follow these easy steps. Open the model in Fusion 360, select the File menu, then Export and save as a F3D or F3Z file to your hard drive. Then use the Attachments section, of a forum post, to attach it.

[jeff_strater]

That's just the way it works.  If you want to get rid of the old body, use Remove to do that.