Odoo has been offering a feature since long but consultants and developers are not sure how to configure and use inter company transaction features in Odoo. I have prepared a use case for two companies within India with same name from different states to make sale - purchase and sale - manufacture transactions smoothly in Odoo.
Please check this video to know how inter company transaction works to automate sales - purchase orders along with manufacturing orders based on reordering rules in Odoo.