Hey, @raghavjhawar .
Tira here to help.
This is a neat product and discount idea! Do you know which free item you wanted to add to your customer’s cart?
I think you could create an automatic discount. Automatic discounts help you add a discount automatically to the cart and the discount code when all eligible items are added to the customer’s cart. You can add a fixed amount, percentage amount, or make a Buy X, Get Y discount.
I think a Buy X, Get Y discount would suit your needs here. Buy X, Get Y discounts require the customer to add a specific amount of products for a discount, and you can choose the number of items a customer needs to buy from your products or collections, and you can choose what the customer gets from products and collections, too.
Check out our help doc for the complete list of steps here: Creating Buy X, Get Y discounts.
I would love to know if this helps!