Alicia here, from the Shopify Guru team!
Happy to help in any way that I can here! Currently through the Shopify POS, when being used on an iPad with the retail package, you can definitely have the ability to add staff members! Set up for this can be found by clicking here. You could use this feature to create a PIN login for your Affiliates for access of your POS when making sales. You can also use this in conjunction with the register shifts option to keep track of your register balance as well!
I hope this helps, Lukas! Please don't hesitate to reach back out if you have any further questions at all!
All the best,
Alicia D. | Shopify Guru