# How to add Add-on price
The **Add-On** function lets you charge an **extra amount** for specific options.\
When a customer selects that option, the extra cost is **automatically added** to the product price.
## Referred Terms
#### Add-on Price
The **Add-on Price** feature allows you to assign an additional charge to specific options within a product.
* When a customer selects an option with an add-on price, the extra cost is automatically applied.
* This amount is added to the product’s subtotal during checkout.
* Use this feature to charge for upgrades, extras, or customizations.
***
#### Add-on Product
The **Add-on Product** feature is used for **stock management purposes**.
* Add-on products are created separately and linked to options.
* They help track inventory when an option is selected.
* Stock levels can be managed directly through these add-on products.
* Refer to the [**Add-on Product Setup Guide** ](https://docs.globo.io/options/add-on-feature/manage-add-on-products) for instructions on how to create and manage add-on products.
## Use existing product
This method allows you to link an option value to an existing product in your store.
* The option will inherit the same price as the selected product.
* This is useful when the add-on already exists as a separate product in your inventory.
**Steps:**
1. Open the **Option** element.
2. Click on the **Price** field.
3. Select **Use Existing Product**.
4. Choose a product from your store.
5. Save your selection.
## Automatically generate product
This method automatically creates an add-on product when you assign a price.
* The generated product is used for **inventory management**.
* This is helpful when you want to track stock for add-ons without creating products manually.
**Steps:**
1. Open the **Option** element.
2. Click on the **Price** field.
3. Select **Automatically Generate Product**.
4. Enter the desired price.
5. Save your selection.
6. Reload the page to see the updated product.
## Add price directly
This method adds an extra charge directly to the main product without creating or linking any product.
* No inventory tracking is applied.
* Suitable for simple price adjustments or service-based add-ons.
**Steps:**
1. Open the **Option** element.
2. Click on the **Price** field.
3. Enter the desired price.
4. Save your changes.
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