Journeys - How can I add a Journey in another Journey task?

Summary:

I'm trying to create a Journey with many tasks but some of these tasks have multiple parts. I can't seem to find a way to embed tasks within tasks so I was wondering if there is a way to create a task that points/leads to another journey. For example if I am making an onboarding journey with a taks called "Technology", I want this task to be able to have a button or something that will lead the person to a whole new journey where they can complete their "Thechnology" tasks.

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