You can create a new quote for the existing job, and this saves your more time.
1. Select the "Jobs" module from the top-left hamburger icon.
2. Select the job, and from the Job details page, choose the "Kebab" icon from the top-right corner.
3. Select the "Quotes / Invoices" option.
4. Select the "Add" button next to the Quote to create a quotation based on the existing Job.
All the customer details and job details were pre-filled based on the Job selected.
5. Other than pre-filled details, select/ add the necessary details.
Finally, select the "Create" button to create the quote.