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You can. Dont forget to designate the groups as Hierarchical however.
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You can. Dont forget to designate the groups as Hierarchical however.

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Where do I need to designate the existing groups as hierarchical?
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Where do I need to designate the existing groups as hierarchical?

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Refering to this article:<br />
<a href="http://social.technet.microsoft.com/wiki/contents/articles/24511.create-hierarchical-address-books-in-office-365.aspx" rel="ugc nofollow">http://social.technet.microsoft.com/wiki/contents/articles/24511.create-hierarchical-address-books-in-office-365.aspx</a><br />
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One of the initial steps is to create a global distribution group, and new member distribution groups. Is it possible to setup the HAB with existing distribution groups that were already created and being used?<br />
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For example, what if for the root distribution group there already is a 'All Users' distribution group that should be used instead of creating a new one?
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Refering to this article:
http://social.technet.microsoft.com/wiki/contents/articles/24511.create-hierarchical-address-books-in-office-365.aspx

One of the initial steps is to create a global distribution group, and new member distribution groups. Is it possible to setup the HAB with existing distribution groups that were already created and being used?

For example, what if for the root distribution group there already is a 'All Users' distribution group that should be used instead of creating a new one?

Office 365 Hierarchical Address Book Setup with Existing Distribution Groups

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.