How to add shop supplies to an invoice as a percentage of the total of the invoice?

To add shop supplies as a percentage in Jobber, you can: (1) Create a “Shop Supplies” item in Products & Services with markup (e.g. 5%), then add it to invoices; (2) Use the discount tool with a negative value (e.g. -5%) as a surcharge and rename it “Shop Supplies”; or (3) Manually add a line item and calculate 5% of the subtotal. Best practice: Clearly show the charge in estimates to avoid client confusion.