To use a custom Calculating field as order value, first create a Calculating field.

View Martin's video on setting up calculating fields as order value:

 This article covers:

• Opening Products in Settings
• Add new product category 
• Enable custom order value
• Adding existing products to product category

Opening Products in Settings

1. Click Settings → CRM → Products:
   
   
   

Add new product category 

Already have a product category with products in it? Jump down to Enable custom order value.

1. Click New product category
   
   
   
   
2. Name the category, we named our category Development
   
   
   
   
3. To enable custom order value you may do this step. Simply click the drop-down menu named Enable Custom order value and select a calculating field (that you've previously created)
4. Click Save
5. Now you've created a new product category and enabled custom order value. All in one go! As a reward, you may jump to Adding existing products to product category

Enable custom order value

Below shows how to enable custom order value to a previously created calculating field.

1. In Products, click the grey bar of the product category to edit it.
2. To enable custom order value for this product category, click the drop-down menu named Enable Custom order value and select your calculating field
3. Click Save.
4. That's it! Custom order value is now enabled for this product category.

Adding existing products to product category

1. To add products existing products to this product category, click the desired product to edit it.
2. Select Place under category and from the drop-down menu, select the product category for which you enabled custom order value. 
3. Click Save
4. Congratulations! You have now added an existing product to your product category.