Users who create org charts in Microsoft Visio may have the need at some point to combine, or merge, charts in Visio. There really is no elegant way to do this.

To create a workflow chart, you can use the Microsoft SharePoint Workflow template in Microsoft Visio. A workflow chart shows a sequence of operations by a person, group of people or organization ...

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Image: Microsoft. Basic org charts are in the version of Visio everyone can use but if you want more layout options you need a Visio Plan 1 or Plan 2 subscription.