I need to add an Installation Kit to the cart automatically, when a user adds a product to the cart. Similar to Step 1 (Requires parts and services), on the Home Depot website. Home Depot requires you to purchase the cord, plumbing, etc. separately.
Home Depot Sample (Add item to cart)
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The charge for the kit is $[url removed, login to view] per appliance. So if customer orders 1 appliance, the charge is $10, 2 appliances will charge $20, 3 appliances will charge $30 and so on.
The charge should be Non-Taxable