In Odoo first, we have to create own modules and then create a function to find the BOM in our own modules.

After this, we will search product on the basis of the product_tmpl_id and relate it to the BOM. 

Here, product_uom is the Unit of measure of a product and this will relate to the List of related properties and return true or false of the BOM id. And finally we have to Search a BOM which has all properties specified, or if you can not find one, you have to pass a BOM without any properties with the smallest sequence.

Use this code in .py file:

def bom_search(self, cr, uid, product_tmpl_id=None, product_id=None, properties=None, context=None):
   
        if not context:
            context = {}
        if properties is None:
            properties = []
        if product_id:
            if not product_tmpl_id:
                product_tmpl_id = self.pool['product.product'].browse(cr, uid, product_id, context=context).product_tmpl_id.id
            domain = [
                '|',
                    ('product_id', '=', product_id),
                    '&',
                        ('product_id', '=', False),
                        ('product_tmpl_id', '=', product_tmpl_id)
            ]
        elif product_tmpl_id:
            domain = [('product_id', '=', False), ('product_tmpl_id', '=', product_tmpl_id)]
        else:
            # neither product nor template, makes no sense to search
            return False
        if context.get('company_id'):
            domain = domain + [('company_id', '=', context['company_id'])]
        domain = domain + [ '|', ('date_start', '=', False), ('date_start', '<=', time.strftime(DEFAULT_SERVER_DATE_FORMAT)),
                            '|', ('date_stop', '=', False), ('date_stop', '>=', time.strftime(DEFAULT_SERVER_DATE_FORMAT))]
        # order to prioritize bom with product_id over the one without
        ids = self.search(cr, uid, domain, order='sequence, product_id', context=context)
        # Search a BoM which has all properties specified, or if you can not find one, you could
        # pass a BoM without any properties with the smallest sequence
        bom_empty_prop = False
        for bom in self.pool.get('mrp.bom').browse(cr, uid, ids, context=context):
            if not set(map(int, bom.property_ids or [])) - set(properties or []):
                if not properties or bom.property_ids:
                    return bom.id
                elif not bom_empty_prop:
                    bom_empty_prop = bom.id
        return bom_empty_prop