automatic removal of source files from the collection

[shellkursk]

I have a collection of 100 photographs. I apply a filter to them that creates a duplicate PNG. As a result, I end up with 200 photos in the collection.
Now I need to export all new photos. Selecting one at a time is a very long time.
How can I do it?

Perhaps you need to somehow remove the original photos from the collection? Or create a new collection from new files? How to do this quickly for 200 photos?

[dj_paige]

Are you talking about Lightroom Classic? In LrC you can't "apply a filter to them that creates a duplicate PNG". Please explain the whole thing in much more detail.