You can add a short answer question "Referral code" in the form and ask the clients to enter the relevant code for the sales person when they submit the form. You can use this field to track and attribute sales to different sales person. Instead of asking the user to enter the referral code, you can create unique prefill links for each sales person. Login to Neartail > click on the form to open it > Edit page will be displayed > In the Neartail Edit page, click on the + icon to add a short answer question > enter the title "Referral Code" > click on the gear icon for this question > Question settings page will be displayed > click Answer > change appearance to hidden or read only and click Save. Unique prefill links in to Neartail > click on the form to open it > Edit page will be displayed > click Share > In the Share page, click Customer > click Links > click New link > New link setup page will be displayed > enter the unique code, click Next > enter the answer for the referral code question and click Create > repeat the steps to create links for each sales person in your team.