There are 2 ways to link a task to an invoice;

  1. Open your draft invoice or create a new invoice
  2. Click on the link button next to tasks in the side panel on the right
  3. Select a task
  4. Click Create Link

  1. Go to a task and in the invoices section click on Link Task with Existing Invoice
  2. In the popup select an invoice
  3. Click Create Link