A recipe can be added as any product when creating a Prebook.  Each product line type Recipe will be marked with a blue star icon.

Recipes can only be modified from the Single Purchasing Mode, from the Add Prebook screen or from the Product Recipes Setup. If the Prebook is already associated to a Purchase Orders, any change made on the recipe from the Add Prebook screen will also be reflected on the corresponding item of the PO. When creating or editing a Prebook from the Add Prebook screen, click on the blue start next to the recipe name. The Recipe Details window will open. Make the necessary changes and click on Add. Once you have finished, click on Close and save the Prebook.