The Linked Items/Managed Items and the Sourcing tabs display information in tabular format like the Grid tab. Unlike the Grid tab, the tables in these tabs have a predefined set of columns. However, you can use their Layout page to add custom columns to the tables.
Adding custom columns to these tabs is similar to how you add column fields to the Grid. The only difference is that the sorting order of rows in these tables is not configurable; rows are sorted in the order they are added and the order cannot be changed.
To add custom columns to the tables in these tabs, follow the instructions in Configure the Workspace Grid. The instructions for enabling these tabs in a workspace are the same as for the Grid tab except that settings are applied to the given tab.