I share this idea, through a post I found when I was looking for the same solution.
"It would be nice it was possible to create a virtual copy when dragging a photo to an existing collection.
What I would like to do: I have a collection "A" with photo X, I drag X to collection "B" and I want to hava VC of X in collection B.
What I currently do: in collection "A" I select X, make a VC, drag the VC to B, delete the VC from A.
So it would be an "addition" to the option that let us add virtual copies when creating a new collection. In my imagination this would happen when I drag and drop a photo and hold some modifier key."
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It would be very useful for me to be able to add a virtual copy of photo A to existing collections.
So I could have a collection for each type of crop format more quickly.
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https://feedback-readonly.photoshop.com/conversations/lightroom-classic/lightroom-classic-add-option...