Auto-Add Product To Cart

In Promotions > Discount Rules you can create a rule that automatically (or with a coupon) adds a product to the customer's shopping cart.

Settings

Coupon Information

On the Coupon Information page you can specify if this rule will apply to specific customer groups, automatically or with a coupon, between certain dates, or how frequently it can be used.

Conditions

On the Conditions page you can build the logic that governs when the free product is added to the cart. For instance, if the user has a specific product in their cart (see below example)

Actions

On the Actions screen you can configure the below settings:

Apply

Set this drop-down to Automatically Add Product To Cart

Product SKU(s)

Enter the SKU that you want automatically added to the customer's shopping cart. You can enter multiple SKUs comma separated.

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Only Simple, Virtual, or Downloadable product types are allowed, and the product cannot have customizations.
Downloadable Products cannot have Links can be purchased separately enabled.

Product Qty to Add

Enter the quantity of the product that you want automatically added to the cart. If you have multiple SKUs, this quantity of each product will be added.
For example, if you enter5 and have 2 SKUs, a Quantity of 5 for each SKU will be added to the cart.

Override Quantity Increments

When set to Yes, any Quantity Increments on the Product will be ignored and the Cart quantity will be set to Product Qty to Add.
When set to No, any Products with Quantity Increments must be added in their respective quantities.

Allow Quantity Updates

When set to Yes, customers can edit the quantity of the added product in the cart.
When set to Yes - But Only from Cart, customers can edit the quantity from the cart, but any time the product is Added to Cart its quantity is reset to the quantity specified above.

Allow Removal From Cart

When set to Yes, customers can remove the added product from the cart.

Product Discount (%)

Enter the discount percentage you would like applied only to the product automatically added to the cart.

0 = no discount on the automatically added product, the user will have to pay full price
100 = 100% discount, the automatically added product is free

Tiered Promotions (Free Items by Spend)

To give more free items as the cart grows, for example 1 free item per $1,000, create one rule for each tier:

Use the Subtotal condition with a range that doesn't overlap the other tiers, for example Subtotal equals or greater than 3000 and less than 4000. The top tier only needs a minimum.
Set Product Qty to Add to that tier's full quantity, for example 3 for the $3,000 tier.
Set Product Discount (%) to 100.

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The free item doesn't count toward the Subtotal
The rule checks the Subtotal before the product is added, so the automatically added product doesn't push the cart into the next tier. You don't need a condition to exclude its SKU.

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Don't overlap tiers that add the same SKU
If several rules add the same SKU to the same cart, they can conflict. Keep each tier's Subtotal range separate so only one rule applies at a time.