[A] In order to create delivery challan after an inter-store stock transfer, go to Inventory module (1) >> stock movement (2) >> approved (3).
[B] Now search that stock transfer and open it by clicking on the document number.
[C] After the document is open click on the Action (4) >> Create Challan (5)
[D] Now fill all the details in the delivery challan and click on the save and send (6)
[E] You have successfully created the delivery challan, you can use Action button to save the pdf copy of this delivery challan