Sales reps on a ticket drive commission and sales rep reporting.
The split is always even. If the site wants an uneven split, the ticket has to be split too.
Sites that pay commission usually want the rep field required at the POS rather than relying on memory. See the Global Payments article on POS requirements and the setting for requiring sales rep and customer at the point of sale.
Use the sales by sales rep report in the back office. Check it in the first week after go live, because a commission plan built on a field nobody fills in will not survive its first payroll.
Source: Global Payments Genius Retail help center. Newly built article, pending review.