Add " Add Purchase Order " function in sales order

Feature Request

In small business , one people may do many things . So after get a sales order , then you may need to purchase items . Then it will more efficient to add a " Add Purchase Order " button in sales order . And you could create several purchase orders and they will link to this sales order automatically . ( Like you could create several sales orders from one proposal , and it will auto link to same proposal now . )

Use case

No response

Suggested implementation

1. Add a " Add Purchase Order " button in sales order .
2. When you click it , it will show a " New Purchase Order " page , there you could choose the vender . Alos you can choose which product line will be imported in the end of page .

Suggested steps

No response