Go to the Wholesale Suite app and Go to "Tier discount" under "Wholesale Pricing".

Click on "Create Discount Tier" button on right side.    

Then enter the "Tier Discount Name", select "Calculation Type" and enter "Tier Discount Value".

Then select the content you’d like the discount to be applied on, you may apply it on your entire store, specific products or collection of products.

Then select the customers you’d like the discount to be applied.

Select the minimum cart requirement before a customer can receive a discount, this step is optional, but you may choose from either minimum quantity of products or minimum cart price as a condition for the discount
Click on save button.