The main and secondary preferred wholesaler configurations are in Shop Configuration.
To set your preferred wholesalers:
From the Minfos Launch Pad:
1. Click the Special menu and select Utilities.
2. Click the Config menu and select 1. Shop Configuration.
3. Select the General tab in the Shop Configuration window.
4. Enter the wholesaler codes into the Main Wholesaler and Second Wholesaler fields.
5. Click OK to save.