Setting up commission for sales staff
Give a staff member a commission rate on the sales they make.
- Open the staff member's profile (or add them if they're new).
- Under their pay details, set a Commission Rate (%).
- Save.

How a sale gets attributed to them
At checkout, a sale is credited to whoever's logged in and making the sale by default. On the fuller Add Sale form, you can explicitly pick a different Salesperson for that particular sale if someone's ringing it up on another staff member's behalf.