Microsoft's Visio allows you to create advanced diagramming, including organizational charts. Data-driven visuals let you communicate complicated ideas clearly. Templates and wizards are included ...

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.

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.