If you already have an account registered and have used it to transact with your customer before, make sure you are logged in and follow the next steps to create an invoice:

1. Click the Workbench tab at the top left of the home screen.
2. Click the Orders tile or any order related tile that applies to your search.
3. Click the purchase order number to open the order up.
4. At the top of the order, click Create Invoice > Standard Invoice.
5. Fill in the required fields.
6. Click View/Edit Addresses in the Summary, Shipping and Additional Fields sections to review or edit address details.

You can also add other elements such as payment terms, comments, or attachments by clicking Add to Header and choosing from the available options.

1. Click Update on the top or bottom of the page to update any calculated fields if you add or modify any amount or rate fields.
2. Enter or modify line item information for the invoice if necessary.
3. Once you complete these steps, click Next to review the invoice before submission.
4. Click Submit when you are done.

If you have not already registered an account, or you have not yet transacted with your customer using your existing account:

1. Click Process Order from the purchase order email notification that you should've received from your customer.
2. Either create a new account or log in with your existing one.
3. At the top of the order, select Create Invoice > Standard Invoice and follow the directions mentioned in the section above.