Run the Create purchase order from purchase offer process to promote the selected purchase offer to an order. The purchase offer is automatically assigned a purchase order code. If you set the relevant option, also the status of the underlying lines will be advanced to an 'Order' status. In this case, you will specify this new status on the processing form.
To copy the offer data (such as the price) from the Purchase offer data form to the purchase order, select the Copy offer data to purchase line check box.
It is also possible to manually convert a purchase offer into a purchase order. To do so, manually assign a purchase order code and change the status of the purchase line you want to include in the purchase order. If there are any purchase lines you do not want to include in the purchase order, set the status of these lines to 'History'.