1. On Your Back Office Go To Settings
2. General -> Tax Settings
3. Click on the plus button and create a tax category called “Sales Tax with CRV"
4. Open the newly created Sales Tax category, click on the plus button and fill out tax name as “CRV”, category code can be ignored as its system generated, tax type "Fee" and a tax amount of your choice. Apply this tax category to any items that require it.
5. Please don't forget to add a sales tax (Tax type: tax) to the same tax category.
The result should look as follows: