I would like to transfer my tasks from an inbox-type file to several more specific files. The command org-refile gives the option to refile subtrees under other nodes, but it does not seem to be able to refile it under other nodes in a different file.
How could I refile subtrees to different files?
Check the documentation for the variable org-refile-targets
. It allows you to specify a list of files to consider for refiling.