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for dir in $(find /rootdir/101/ -type d -name "B??"); 
do find $dir -type f -exec rm '{}' \; ;
...

# or to move elsewhere
# do find $dir -type f -exec mv '{}' /tmp/foundstuff/ \; ;

$ find /rootdir/101/ -type f -exec mv '{}' /tmp/foundstuff/ \;