I have created some list of products , attributes and attributes values, Now i  have to import product variants and its price how to make csv like that.

Note:  I imported products with out variants because in products csv im able to choose multiple variants like color red,green,blue  . but i cant specify price for each varients in products csv.

Also  please tell me good way to avoid multiple variant combinations because i have multiple attributes so it create multiple products based on attributes values basically i dont need all combinations.