import source files from list

Sometimes I have to be able to copy specific files from my archival server to USB for a client, and being able to import a text file list of the source files (thousands, sometimes tens of thousands of files) into the move list would be great, with the option to set a source root folder, and maintain the subfolders from the file list as well.

Equivalent batch script syntax is ( superuser.com/questions/1236553/copying-files-with-certain-names-from-a-list )