Make sure the Quotes tab is selected as shown below.
Select the quote from which you wish to create an invoice. Press
the Convert button.
A new invoice will be created
with the same details as the quote being copied but with a new
invoice number and the current date.
A form will be displayed
allowing the invoice details to be edited. The form should look
something like the following.
Edit the invoice if
Press Close & Save
to save the invoice.
Note: After saving the
invoice, the Quotes tab updates to show that the quote has been
converted to an invoice. When the quote is selected, the Details
panel at the bottom shows the status Converted and the invoice
number into which the quote has been converted.