Hello,

I'm looking to create a module allowing me to launch a production of several production orders.

for that I started to realize a Wizard allowing me to select 

1 : input lots (components)

2 : finished product lot

3 : the workcenter

the wizard code (Python and XML) 

 1 : https://pastebin.com/JsGzri5m Wizard (Python) 

 2: https://pastebin.com/SkaJr2WL Wizard (XML)

I had to search in the odoo v13 repository in the mrp application to see what level it will be able to intervene to perform this operation but I don't find that it extends method or how to do it. 

I thought of extending the action_assign method of the mrp.production model because the associated operation is exactly what I'm trying to do but I'd like to limit the batches that can be assigned by those selected on my wizard.

thank you in advance for your help.