I guess that this section will help you define your organization's Business Unit/Planning Group.
https://help.mypurecloud.com/articles/planning-groups-overview/
Planning groups allow users to include more than one queue, language and skill set in the planning group; however, if you combine queues, languages, and skill sets make sure to review the agents who can handle the planning group. If a planning group is made up of more than one set of queues, language and skill sets, forecasts only display the combined values for the planning group, and the schedule generation process look for agents who can handle the entire planning group, not individual pieces of it.

Att,
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Breno Canyggia Ferreira Marreco
https://www.linkedin.com/in/brenocfm-40b62182/------------------------------