You can access existing Invoices from a Client Account or from the Invoice List (Accounting > Invoices). On the Invoice List, click any Invoice Number to open the corresponding Invoice overlay. The Invoice overlay will look something like this:
The first thing you may notice is that the Client cannot be modified once the Invoice is generated. The Address, Tax Ref, Terms and Payment Method are determined by the Client defaults. Any of the fields in the right column can be modified. If you adjusted the Invoice Date this may change the Status of the Invoice.
You can modify any of the existing line items by clicking the pencil icon or on any of the fields on the line item. If you're going to continue working on the Invoice, be sure to click Save on the line item when you're done:
To add additional services or products to the Invoice, click Add Line Item. When you save each new line item the totals will update at the bottom of the Invoice.
The checkboxes at the bottom of the Invoice allow you to modify the Print and Email flags. You can also lock the Invoice or flag it for review.
You can use the Memo field to record internal notes about the Invoice. The Client will not see these. If you need additional text to appear for the Client on the Invoice you will need to update the Invoice Description.
When you're finished editing, be sure to click Save at the bottom of the Invoice.