# BOM
To create a Bill of materials you need to create a new product
### Standard fields
Fill the standard product fields. (like in a simple product)
Go to products and services and create a new product.
### BOM definition
From the Fullfilment list select the bom as back order
In the general fulfillment section you have next fields:
* base qty-initial production quantity
* estimated cost-derived from the sum of costing of each component
* minimum stock qty
* and estimated time
In bill of materials section you need to build up your componentes and sub components
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You can create different types of BOM:
* single level
* without final product
* services only
* and multi-level or complex BOM
### Other settings
as you define all components you can continue with product definition in other sections:
* define images
* barcodes and serials
* additional info
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