Go to Tx- VA01 and create a sales order of type – OR.
So here we can see different order reasons. Now we want a new order reason.
Execute Tx- SPRO and navigate along the shown path.
Select New Entries.
Create a new order reason. Save and back.
Here it appears in the reason list.
Now execute Tx- VA01 and try to create a new sales order of type- OR and from the order reason the new added reason text can be found.