You can use Wholesale Club on the Shopify POS app to create orders for wholesale customers in person.
On the left-hand side of the POS cart, tap Add tile then App.
Tap App, then select Wholesale Club.
Add products to the cart eligible for wholesale discounts. Make sure to select products in a collection targeted by one of your wholesale discount rules, or a product that has a Custom Price assigned.
Under the More actions menu in the cart, select a customer with the applicable wholesale tag.
Once you've added the correct customer, tap the Wholesale Club tile in the cart:
After seeing a green confirmation banner, your wholesale discount will be applied in the cart.