In SAP SD (STO) has Six Stage that complete full Stock Transport Order .
STO PO Create
PT-Code: ME21N-Create Purchase Order

Delivery Document Create
VL10B-Purchase Orders Due For Delivery

Complete the PGI
VL02N-Change Outbound Delivery
Goods receive for receiving plant
MIGO-Goods Movement
Open PO report
ME2L-Purchase Orders by Supplier
Stock in transit
MB5T-Stock in Transit CC