When you need your customers to have an specific price on the sale, on the mobile devices you should set it at Main Menu > Settings > Orders > Discount Structure > Type > Specific Client ($)
Main Menu > Settings
Sales orders
Discount Structure > Type
Touch > Specific Client ($) Up to 5 Price List
Database > Clients
Select the customer, touch Price List > Select the price for that specific customer > Save
To check how it works when doing sales: Dashboard > Sell
New basket
Select the customer
Select the product
Touch Price label to view or change the assigned price.
On the web version you should set it up, too. That is at > Settings > Sales Orders > Discount Structure > Type
Settings > Sales Orders > Discount Structure
Type > Specific Client ($)
if you want to assign the Price List to each client you may do so on the web version at Clients > View / Edit
Select a Client
Change the Default price A and click on the check-boxed