Sun Item on Timeline/Gantt concatenates Item name

Is there a way to not show the Item name on the sub item on the timeline. For example:

I have an item: Policy System Migration
I have a sub item: Requirements

In the Timeline & Gantt when I choose to show subitems group under the parent, the sub item displays as:

Requirements | Policy System Migration

I would like to hide the Policy System Migration part in the label.