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sub·file | \ ˈsəb-ˌfī(-ə)l 
\
\variants:
or sub-file
plural subfiles or sub-files
Definition of subfile
: a file (such as a computer file) that is part of a larger file or derived from parts of larger files
You simply search through existing files for all the records matching a particular set of criteria and designate those records as a subfile.— Robert Moskowitz
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Time Traveler for subfile
The first known use of subfile was in 1962
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