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.

Let's see on how to set such a rule:
Navigate to Woocommerce --> Woo Discount Rules.
Here, select Price based rule and click on "Add new rule".

Step-1 : General tab

Specify a rule name and choose Dependent product based discount as your discount method. 

Step-2 : Condition tab

 Discount condition is that, if I purchase each 2 quantities of clock and mirror, they would get a 30% discount in 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

There are different conditions you can set:
Buy any (clock,mirror) more than 2 and get discount in mugs
Buy each(clock,mirror) equal 2 and get discount in first quantity mug.
Buy combine(clock,mirror) less than 5 and get discount in Skip first quantity mug. 

Check out few examples here. 

Still unclear ?
Please submit a support request. We are always happy to assist you :)

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