I have a new form which is integrated with a customized button on sale order lines.

I have product_id and partner_id on my new form just as they are on sale.order.I want to automatically fill my form fields . But instead of inheriting one field it is inheriting the whole sale.view_order_form into my new form

Inheritence code is 

class ManufactureForm(models.Model):
    _inherit = {"sale.order": "product_id"}
    _name = 'manufacturing'
In my XML file 

<record id="manufacturing_form_view" model="ir.ui.view">
   <field name="name">Manufacturing Form View</field>
   <field name="model">manufacturing</field>
    <field name="inherit_id" ref="sale.view_order_form" />
   <field name="arch" type="xml">

Please guide me thru it because m a beginner