In RSSP How to add/cancel/duplicate lines, Edit Price,UOM,change location,attach file,view approver?

Summary:

The Requester is trying to create change order of a purchase order from RSSP purchase requisition page. The Requester is not able to add lines because there is no '+' or add option is available also for quantity-based purchase order requester is not able to change price and UOM, deliver to location, cancel old lines, duplicate lines, View change order approvers detail before submitting change orders

Content (please ensure you mask any confidential information):

Business wants to create PO change order from Approved purchase requisition from RSSP purchase requisition page but requester not able to add lines because there is no '+' or add option is available also for quantity-based purchase order requester is not able to change price and UOM, deliver to location, cancel old lines, duplicate lines, View change order approvers detail before submitting change orders