To create an Invoice, click Invoices on the left. Click the blue New button on the top right.
Note that you can also create an invoice directly from the Edit Work Order screen by clicking the three dots to the right of Complete. This can only be done if the equipment has been assigned a Customer in the Edit Equipment screen.
On the New Invoice screen select a Customer on the top. You can enter a billing / shipping address. Click 'Add Item' to the bottom to populate the invoice.
You can add completed Work Orders to an invoice, along with parts and other miscellaneous items.
The Invoice total will increase as more items are added. The system will track how much of the total has been paid.