Windows 11 From a large file how to extract only certain files?

[Jon N_T]

Hello, First i apologize for most likely describing this poorly! I'm trying to create a new smaller file from a large file folder that has ~10,000 pictures inside of it without manually copying the folder and deleting each, as the pix are updated annually so we'd have to do this every year. There are ~3,500 separate properties but ~10,000 pictures. So ideally i would like a new separate file with only the first picture of the first building. They are labeled in this manner: K=property. B=Building; P=Photo . There are ~3500 K's. then each k can have multiple buildings and then each building c

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