I don’t use Fusion 360, but I saw a video that might have your answer.
Written instructions of what John says in the video…
- Right click on the component you want to copy
- Click Copy
- Right click on the part name at the top of the component tree
- Click Paste New
I notice that the “Paste New” command doesn’t have a keyboard shortcut. I bet that can be changed, but I don’t know how.
And here’s the video… (the copying and pasting starts at 7:07)