Universal Containers has a custom Quote Line picklist, “Process.

Update the EditLinesFieldSetName formula to return “Process” in the returned comma-separated stream.

Edit the “Line Editor” field set on the Quote Line object and drag in the “Process” field.

Edit the “Quote Line Layout” page and drag the Process field into the “Line Editor” section.

Add the “Process” field to the “Line Columns” multi-select picklist on the Salesforce CPQ Installed Package settings.