Additional fees are configurable charges that Rundoo adds alongside a product's price on sales, orders, and transfers — things like delivery, paint-care surcharges, hazardous-material fees, or environmental fees mandated by state.
In the Admin > Product tab, scroll to the Additional fees section — it's the first section on the page.

Each additional fee is either a flat dollar amount ($5.00 delivery) or a percent of the subtotal (11% CA F&A). When a fee is active for a location, Rundoo applies it automatically to every qualifying transaction there — no cashier action required.
A fee has three independent scopes, each a toggle:
Turn on the ones that apply. Most real-world fees apply to sales only (delivery, paint care), but a few cover all three (installation, core charges).
Fees can be taxable or non-taxable — the Sales taxable toggle controls whether sales tax is calculated on top of the fee. Regulated environmental fees (California Paint Fee, most state core charges) are typically non-taxable; service fees like delivery and installation are typically taxable.
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One fee per product. Additional fees attach to a product, so a given product can only carry one fee at a time. If you need multiple rates together — an Eco Fee plus a percent surcharge, for example — combine them into a single fee (raise the percent, or bundle the flat amount). Stacking multiple Additional fee records on the same product isn't supported today.
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Click Add additional fee at the top right of the section. The Add additional fee modal has four areas — a name, a fee amount, the scope toggles, and per-location overrides.

Delivery, Paint Care Fee, Core Charge).amount (flat dollar) and percent (% of subtotal). Pick one and enter the value.Sales taxable, Apply to sales, Apply to orders, Apply to transfers. Leave any you don't need off.