Invoice owners can add lines to an invoice. To add lines, invoices must be in either New, In Progress, Reset, or Rejected status. 

Tab through the last line

On the last line of the invoice, hit Tab twice on your keyboard once more and the system will add a new line.

Use the Add Line Item button

Click the Add Line Item button to add as many rows as needed below the initial coding line

Add above/below selected

Select a line and click the arrow beside Add Line Item. Select Add Above Selected or Add Below Selected to add a row above or below the selected row.