1. Login to Fresa Gold and navigate to Masters–> Organization and select an organization (Fig.1)
2. Now select the Employee tab and select department as Sales and select the Employee name and click Save (Fig.2)
3. Now if you create a shipment for that organization it will show the sales person in the shipment as default (Fig.3) & (Fig.4)
Hope you got an idea about how to auto pickup salesperson in shipment.