Unfortunately there is nothing prebuilt in the cms to make changes to multiple assets at once due to how different assets can be.
However a script can be written to make the change across multiple assets. Generally these scripts will use a filterlist (https://developer.crownpeak.com/Documentation/CMSAPI/Asset/Methods/GetFilterList(FilterParams).html) to generate a list of assets than traverse through them to change the values necessary.
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David GreenbergCustomer Support Engineer
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