https://www.youtube.com/watch?v=qqeNA_4O0Qg&t=1332s around the 20 minute mark.
He takes the top of the donut, Shift-D, then P.
When I do this I can’t move the duplicated object. There is a red border around it.
Thank you.
“Shift+D” duplicated the selected faces, and “P” separated those duplicated faces into a new object.
To move or edit the new object you just need to use “Tab” to get out of the first object’s Edit mode.
And welcome to Blender, and the forums!
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I think maybe he said “G” not “P”. Press G to move the duplicated object and left-click on the mouse to confirm the location.
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If you have duplicated it, but are still in edit mode, you can no longer iteract with hte newly separated object until you return to object mode.
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Thank you so much guys.