1) At the Blanket Order line, change the 'Qty. to ship' field to the quantity that you want to make to Sales Order.
2) Click on the 'Make Order' button to create a new sales order with the quantity specified in the 'Qty. to ship' field.
3) Click on the 'Yes' button when prompted to confirm on the sales order creation.
4) Once the Sales Order has been created, you will receive a messagebox with the following message:
Order SOxxxxx01 has been created from blanket order BOxxxx03.