Windows Undo Undo undoes the last thing you did. Undo only works on operations that change the model. Cut Cut will take the selected objects out of the model and put them in the clipboard.
Objects maintain their material definitions and other characteristics.
Copy Copy will copy the selected objects from the model and put the copy in the clipboard, the objects will remain in the model and can be pasted again into the same model or a different model. Paste Paste places copied objects into the model space according to their original world coordinates. If you want the pasted objects in a different location, just move after pasting. A dialog box will open, allowing you to choose scaling and alignment options. Once you click OK, the frame is scaled, rotated, and moved to fit exactly into the selected opening.