
You can reopen (recall) a Closed Won Opportunity to move it back to the Negotiation/In Progress stage and make changes (e.g., update billing terms on the quote).
After reopening:
If the Reopen Opportunity button is missing or grayed out, let me know your exact Dynamics 365 version (Sales Professional/Enterprise) and any error messages — it could be a security role or business process flow configuration issue.
Let me know if you need help with the quote changes after reopening!