You can be able to set this discount type only with our PRO version

Consider there are three products in your store A, B and C. C gets a discount only if customer buys 2 from product A and 2 from Product B.

Step-1 : General tab

Give the basic details of your discount rule and choose Dependent product based discount as your discount method. 

Step-2 : Condition tab

The following each product should have quantity 2 to get discount 30% for Product C = Mugs.
Product A = Clock
Product B = Mirror

So the condition should be like

Buy = Each - Equal - 2
Product(s)  from = Clock, Mirror
Get discount in = Mugs

Step-3 : Discount tab

Choose discount type - Percent and set the discount value - 30
Save the rule. 

Step-4 : Frontend demo

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