Ability to create single sales order with standard (Item having stock) and back to back type

Summary: How to create sales order with items having on hand stock (Standard flow) and items not having stock (Back to Back flow) in single sales order. What are the setups and configurations need to be done for this.

• These Lines should not be closed untill all the lines got fullfilled .
• The line with B2B should be shipped along with freight item. which is to be invoiced with same SO.
  

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