If you want to extend a quotation, go to the quotation dashboard and select More and select Extend quotation and select a new date.
Change a quotation
If a quote has expired, you can duplicate and resend it in this way:
Go to the event and click on quotations above the timeline.
Click on the duplicate icon
The quotation will be duplicated (the content will be included in the new quotation) and can then be sent back to the client.