Go to the Sales command centre and click Sales Register. The Sales Register window appears.
Click the Quotes tab and select the required quote.
If you want to change the quote to:
an order (Not Basics), click Change to Order an invoice,
click Change to Invoice.
The Sales window appears.
Make any necessary changes to these and other fields. For example, change the transaction date to today’s date.
Want to retain the invoice number? To retain the original invoice number when you change the sale type, select the Retain Original Invoice Number when... option (Setup > Preferences > Sales tab).
Click Record. The new order or invoice is created. The original quote will remain in the Sales Register window unless you indicated in the Sales view of the Preferences window that you want quotes to be deleted when they are changed to orders or invoices.