GPO to create subfolder and copy file
Solution 1:
You can create a Group Policy Preference to accomplish this.
Under User Configuration > Preferences > Windows Settings > Files
create a new file.
Set the source file location \\your.domain\NETLOGON\file.txt
Set the destination: C:\Users\%logonuser%\myFolder\file.txt
. Any non-existent parent folders in the destination will be created.
Then set the preference to Apply once and do not reapply