When you go to create a Quote, Salesforce automatically grabs the Products from the Opportunity and creates QuoteLineItems. Is there any way to override this behavior?
There used to be a way to do this using the boolean Quote field CanCreateQuoteLineItems. This field is marked as not used in the documentation.
CanCreateQuoteLineItems Type boolean Properties Create, Defaulted on create, Group Description This field is not used.
I do not fully know what your use case is, but using a Flow would be the easiest way to override this standard process in favor of a simpler approach (create new Quote via Flow only mapping relevant Opportunity fields).