I'm trying to create a few timelines within the parent timeline that are
overlapped.

Say I have a timeline from Jan to Dec and want to do two expanded timelines,
one from Jan to June, and another from Apr to Aug. Its not allowing me to
have expanded timelines that are overlapped. I am able to create non
overlapping timelines on the parent timeline, and I'm also able to create a
nested expanded timeline within the child timeline.

Is there a way of setting up overlapping expanded timelines at the same level?

Thanks