Migrating users and groups from CQ 5.5 to AEM 6.1

Hi 

Have you checked "ACL Packager".

Link:- https://adobe-consulting-services.github.io/acs-aem-commons/features/acl-packager.html

It can help you set ACL permissions and users/groups between AEM instances.

Link:- http://www.tothenew.com/blog/users-migration-from-cq5-6-to-aem-6-06-1/

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        In order to solve the above problem, we are still going to use package manager. Follow the steps below:
        Create a package and put all the users & their groups.
        Exclude few users & groups :
        admin & administrative anonymous (not necessary but good to keep it excluded)
        If same user & group are found in both environments;  delete from AEM 6 instance before installing 5.6 user package. You should ignore admin & anonymous here too
        Install it
        To verify your accounts, login with any of your group. Also you can verify logged-in users privileges.

Some Old Post links for your reference:-

Link:- http://help-forums.adobe.com/content/adobeforums/en/experience-manager-forum/adobe-experience-manager.topic.html/forum__0mo3-we_have_a_groupname.html

Link:- http://0-help-forums.adobe.com.libcat.ferris.edu/content/adobeforums/en/experience-manager-forum/adobe-experience-manager.topic.html/forum__t1gr-hi_imagine_acas.html

Link:- http://0-help-forums.adobe.com.libcat.ferris.edu/content/adobeforums/en/experience-manager-forum/adobe-experience-manager.topic.html/forum__efut-hi_i_need_toup.html

Thanks and Regards

Kautuk Sahni