For making the Dropship purchase order form preferred, we had to do the following
Go to Setup –> Accounting –> Accounting preferences, Click the Order management option at the top. In it under the Drop shipments and Special Order settings, there is an option to set the form for Dropship PO.
When a Dropship purchase order is created, NetSuite automatically uses the form chosen there. By default, the form added there will be the Standard Dropship Form. We can change it to our custom form.
