Pre-requisites: You must have the "Manage cross-reference lists" user right.

1. Navigate to the gear icon > Data Management > Cross-References (in the Purchasing section). 
2. Select the organization whose cross-references you want to update.
3. To import a list of cross-reference click Import.
4. To edit existing references, click any cross-reference list. You can edit the basic data, source code, and target code. 
5. When finished, click Save to save the data.
6. Click Export to export the selected list's data to a CSV file.