Here, you have the option to create custom fields. If a field is missing from the standard fields/columns included in Maintenance Planning, you can create it here. You can add 5 extra fields to Objects, Building Components, and Maintenance Activities.
In the example below, 2 extra fields have been added at the object level.
You can then find these fields under the Object Info tab, Extra Info, as shown in the example below.
They can also be found at the bottom of the column selector.