Hi，
Yes, you can use group policy to append a value to a registry key.
You can follow the steps as below:
>>Open the Group Policy Management Console . Right-click the Group Policy object (GPO) that should contain the new preference item, and then click Edit .
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>>In the console tree under Computer Configuration or User Configuration, expand the Preferences folder, and then expand the Windows Settings folder.
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>>Right-click the Registry node, point to New, and select
Registry Item.
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>>In the New Registry Item dialog box, select Action（create, update, replace,delete） for Group Policy to perform.
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>>Enter registry settings for Group Policy to configure.
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>>Click the Common tab, configure any options, and then type your comments in the Description box.
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>>Click OK. The new preference item appears in the details pane.
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You can check the below links for more details :
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https://blog.thesysadmins.co.uk/group-policy-preferences-1-deploying-registry-settings.html
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http://www.blackforce.co.uk/2013/01/27/create-delete-modify-registry-keys-using-group-policy-preferences
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https://technet.microsoft.com/en-us/library/cc753092.aspx?f=255&MSPPError=-2147217396
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Best Regards,
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Elaine
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