Shopify recently released a new feature where a shop owner is able ad cost per item within Shopify to be able to see Net Profits.
Below is a step-by-step break down of how to add cost per item within Shopify.
In your Shopify admin, click Products.
Click the name of a product to edit it.
In the Pricing section, add a dollar value in the Cost per item field. The cost per item is how much it costs you for the product or variant. For example, if you resell a product, then you can enter the price that you paid the manufacturer, excluding taxes, shipping, or other costs. If you create the product yourself, then you can enter a value that is based on your labor and material costs.
To learn more about this Shopify feature, click HERE.