First off, let's describe what is a multi-level product is.
A multi-level product is one that contains a product within a product. For example, some businesses will make "intermediates" or "premixes" that are then used as an ingredient within another product.
Zubi manages this situation by allowing products to be LINKED.
Linking a product effectively means it has been converted back into an ingredient that you can then use in a recipe within another product.
You can use the Link Ingredient option either when creating (adding) a new product or when you are editing a current product.
To "Link" a product and convert it into an ingredient simply tick the box on the ID tab of the product.
The linking option can be used for products in either draft or calculated status.
Once you have linked a product Zubi will make a copy of the product and store it within the ingredients section.
It will have the same code as the original product but will have a " i " added to the end of the code.
When you open the product you'll see the ingredient it's linked to is shown in the top right hand corner.
You can then add the linked product / ingredient to a recipe in the same way you would do for any other ingredients.