Order: Priority of your rule.
Rule Name: Provide a rule name, here it is "Variant Product"
Rule Description: A two line description of your rule.
Method : Select "Dependant product based discount".
Validity : You can select date if you need to limit this discount for a particular period of time.
In the discount conditions tab, you need to specify for which product you need to provide the discount for.
Buy: Here the rule is to give discount when any combination of the variant product is purchased above 10 quantities, then discount will be applied for all the variant products in the cart.
Applying Fixed $10 discount for all the product variant combinations .
The Rule applied with $10 discount for each product when 10 quantities of the variants are purchased.