1. Open the Job/Sales Order that requires a part invoice

2. Select the invoice pre-build to use

3. Select the pre-build and click the "Part Invoicing" field.

4. Enter the percentage to be used for this invoice

5. Click the "Keep Line Items" to list all items on the resulting invoice. Leave it unticked to have one summary line on the invoice that will state something similar to "20% of £150"

6. Click "Create"

7. To generate another part invoice, re-do the above steps. To generate the final invoice, go back to the Job/Sales Order, and click on 'Create Invoice"

8. Select the invoice pre-build

9. Click the "Part Invoicing" field.

10. Click the "Keep Line Items" field.

11. Click the "Invoice Remaining" field.

12. Click "Create"