You may be using line item properties to store data about your customer's orders, such as the Product Customizer app. To adjust the line item properties for an existing subscriber:
In the ReCharge Dashboard go to Customers.
Search and select the desired name.
Click on See Details next to the Address ID.
Click on Edit Line Item Properties to open the collapsible menu and display the option to Edit Line Item Properties.
Add any properties as needed and Save Changes.