Orders to Suppliers

Some options in products and suppliers would be very interesting to achieve this function

I will make a brief description
WHERE the suppliers have the option of carrying the purchase invoices, so it can be established for those suppliers that provide us with credit to be able to charge the invoices and establish partial or total payments as appropriate.
So it would be very good, have the option to generate the order from the application and thus be able to send them for example by email to the supplier, this order to simplify the process would have to be edited, so that if for example of product 1 requested 10 units and the supplier sent us only 4 can be changed and have the option of transforming that order into supplier invoice by adding the supplier's invoice number field and that by agreeing with the purchase and accepting it can add those products to the inventory directly with just validating the invoice.
For this, the product should have an additional field with the number sku used by the supplier to make it easier to process the order. Thanks for your time