Any OOTB workflow is available for the join type "Rendezvous (AND)" . I have a similar requirement that three group of people approval should happen parallel and go for the rest of the approval once that groups approved.
I worked with Arun via support case and provided with sample process with parallel split
In the past (must have been Clarity version 7.5.3), I have used Rendezvous to execute multiple steps in parallel in a workflow. However, given the ability to create multiple actions in a single step (which was added in subsequent versions), the need for using Rendezvous type split has diminished.
Now, to your question - if the three approvals are different (in terms of the action item description, nature of approval), a rendezvous type split may be appropriate. However, if it is the same action item that you are seeking approval on, I would suggest using a single step with multiple assignees for that purpose. In the post condition, you can always check the approvals before you move to the next step.
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