A SKU (Stock Keeping Unit) is an alphanumeric code that can be made up of letters, numbers or both of any length. It is unique to each OneCart product based on its variant option for eg, size, model and colour depending on the type of inventory.
Parent SKU and Variant SKU
In OneCart what is known as a Parent SKU is called a "Product Code". To put it simply, every item has a SKU tagged to it. From a Parent SKU, it may have various variants SKU or share the same SKU.