How can we do Purchase Order amendment for terms and conditions?

System has the provision to amend Purchase order purchasing terms like packing, freight etc.
Click on the Add button to create a PO Amendment transaction. Select Purchase Order (PO) number which is to be amended users can select the relevant PO number from the pop help. Click on the Next button to move to the PO amendment detail and click on the Next button to move to the PO Amendment Terms. Select the line number of the Purchase order, Term, whose details are to be edited from the pop help. It is mandatory. Select the term code applicable for the PO from the pop help. It is mandatory. Description of the term code is automatically retrieved from the terms master based on the Term code entered.