Yes that is useful and that doesn’t work from the context menu because it doesn’t appear in the menu if you right click on the selection. I always get Invert Selection from the Edit menu or use a keyboard shortcut.
In the case of @Herk’s issue, it should be solved if he right clicks on the selected entities or just uses the keyboard shortcut for Create Component.
I do right click on the selected geometry to create the component (or group).
I will verify that.
Oh my gosh, that is the problem. I wasn’t right clicking within the selected geometry. Many thanks Dave. I’m sorry for the trouble and confusion.
Glad you got it sorted. You should probably mark my post as the solution.
I will gladly do that Dave, now I just need to figure out how to do that. 
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Just scroll through the posts in the thread and tick the check mark at the bottom of the post with the solution.