How do I change hourly billing, descriptions or code columns in the free invoice tool?

Use the Invoice Details panel, which the current tool page says opens from the pencil icon on the items table. The available controls include Quantity or Hour, Description and SAC/HSN. Use them to show the billing unit, extra item description or code column you need.

Check the preview after changing the settings so the invoice shows the intended units and labels. Add more lines with Add Item when you need to bill for separate items. Showing a SAC or HSN column does not select or verify the correct classification for you; confirm uncertain codes with your adviser. These are layout and billing controls, not a tax-filing service or a promise that a hidden code is no longer required for your records.