Office 365 and SSO questions

Office 365 and implementing SSO to a system already in place.
So 2012 AD on prem and i want to sync it to Office 365 using the Azure AD Connect system. Only want passwords synced.

https://channel9.msdn.com/Shows/OEMTV/OEM1710

above link shows how to set it up from scratch, shows all the on prem users been added to Azure AD. I already have my users in place in 365, im assuming when i set the sync going it will add all the users from onprem to Azure AD also.
Im looking at duplicate Azure AD users then in the 365 portal?
Can i get it to sync with the current setup, link on prem to the users already setup in Office 365 Azure AD?
if so how do i go about it

Ta
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SoHandyAsked:
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Vasil Michev (MVP)Commented:
If you already have the user accounts provisioned in O365, you will have to "match" them against the on-premises ones in order to avoid duplicates. You have two options:

1) Soft match as detailed here: http://support.microsoft.com/kb/2641663
2) Hard match as detailed here: http://blogs.technet.com/b/praveenkumar/archive/2014/04/12/how-to-do-hard-match-in-dirsync.aspx
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Saurabh YadavMCPCommented:
In order to avoid to duplicates you can follow the below mentioned options:

1. Soft match: http://support.microsoft.com/kb/2641663

2. Hard match: http://blogs.technet.com/b/praveenkumar/archive/2014/04/12/how-to-do-hard-match-in-dirsync.aspx
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SoHandyAuthor Commented:
Ta mate
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