Yes.
Open a new part file. Finish the sketch and then delete it in the browser.
Go to the Tool Panel and select Derive (it's near the bottom) the select the assembly you want to derive into the part. You can choose which parts to include or all of them.
Once the link between the derived part and it's origin has been broken it can't be re-made. but you can suppress or suspend the link and un-suppress or un-suspend later
HTH
Duncan
@home
🙂
Duncan Anderson
"Humour is one man shouting gibberish in the face of authority, and proving by fabricated insanity that nothing could be as mad as what passes for ordinary living." {Terence 'Spike' Milligan KBE (16 Apr 1918 – 27 Feb 2002)}