Non-Destructive means of applying an effect

I'm looking to apply a Gaussian blur effect to certain areas of my work, but in a non-destructive way.   I can duplicate a layer and apply the effect to the duplicate, however, some of the areas I wish to blur are comprised of multiple layers and groups and duplicating is a not  straight forward.

Anyone have a non-destructive means of doing this?

Thanks!!

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  • painter doesn't support non-destructive blur adjustment layers.

    > I can duplicate a layer and apply the effect to the duplicate, 

    you can merge visible layers, paste in merged image, blur the entire layer and paint in blurred areas with a layer mask feature, which however is better done outside of painter as a post-processing effect because masked layers drop painters performance a lot

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