1. Select Sales.
2. Click on Maintenance.
3. Go to Sales types form.
4. Enter the Sales Type Name.
5. Enter the Calculation Factor.
6. You can include or not include tax in or from sales type you insert by clicking on the check box.
7. Now click on the Add New button from bottom.
8. You can Edit or Delete the existing sales type by clicking on edit or delete icon from the right.