Group Policy Central Store and Administrative templates

I'm looking into updating the Administrative Templates currently used in our DCs. I would like to install Windows 10 Administrative Templates.
The servers are Windows Server 2008 R2.
At the moment, the DCs are just pulling the templates locally from C:\Windows\PolicyDefinitions

Since there are multiple DCs, I'd rather not have to update this folder one by one, so I did some reading and found about the Central Store capability.
I know how to copy items to the sysvol folder and how it should work. I just want to confirm a few things before I make any change.

1. If after I create the FQDN\SYSVOL\domain\Policies folder, I leave the C:\Windows\PolicyDefinitions untouched, will the Group Policy editor ONLY read the .admx files in the sysvol folder?
So it will completely stop reading from the local PolicyDefinitions folder?

2. Is there any chance of the currently configured Group Policies breaking from this update?
Say because a certain policy was discontinued or its location changed in the 'Administrative Templates' hierarchy?
SeeDkAsked:
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Joseph MoodyBlogger and wearer of all hats.Commented:
1. Yes - The GPMC knows to look in the central store first before the local folder. Don't remove the local files.

2. No. ADMXs just allow the GPMC to know what settings are available to configure.
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Adam BrownSr Solutions ArchitectCommented:
1. If there is a Policies folder located at FQDN\SYSVOL\Domain\, GPMC will only read from that location for its Admin Templates data. Local policy requires that C:\Windows\Policydefinitions be there as well, so don't delete the files that are there. Just copy them.

2. Generally, no. The GPO data itself contains the information needed for computers to apply the policy. If there is a policy defined in a GPO that does not exist in the Administrative Templates used to build the policy editor, those settings will remain and cannot be changed (GPOs store the registry key information that is supposed to change based on the Administrative Template definitions).
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SeeDkAuthor Commented:
Thank you, I will go ahead and create a store then.
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Windows Server 2008

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