This is a great example of the power of Automated Actions to do something useful.
Credit to Jake Robinson for this tip, which automatically creates a BOM for new items:
if record.categ_id.id == 6:
env['mrp.bom'].browse(1).copy({'product_tmpl_id': record.id}) Notes:
- The “apply on” means that it will not create a BOM for service items.
- Selection by product category is done in the Python code.
- You need to know the record IDs of the product category and the BOM you will be copying (in this case the product category id is 6 and the BOM we are copying is record 1).
- You could easily have different BOM templates for different product categories:
if record.categ_id.id == 6:
env['mrp.bom'].browse(1).copy({'product_tmpl_id': record.id})
if record.categ_id.id == 7:
env['mrp.bom'].browse(2).copy({'product_tmpl_id': record.id}) 
Odoo tricks and tips 
hello, thanks for sharing. where the BOM is actually defines?
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You need to create the BOM first and check its record ID.
The first BOM you create should have a record id of 1, and that is what is used in the first example. The second example assumes you have created two BOMs with record ids of 1 and 2.
Instead of using browse(1) you can select the BOM you want to copy in other ways.
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