1. Go to Products > Categories.
2. Hover over the Category in question, then click Edit.
3. Scroll down to the Wholesale customer field, then input a % value (i.e. 3 percent then enter 3, 30 percent then enter 30, 0.3 percent then enter 0.3.)
Note: If you would like to restrict the visibility of a complete category to a specific Wholesale role (i.e. “Merchandise” products can only be seen by “Silver” customers) you can do this with the Wholesale role filter.
4. Click the Update button.