How to split a usb key

I have recorded my old vinyl disks onto a USB key (one face of a vinyl disk is one item on the USB key, i.e. 20 mn approximately).

I would like now to split these items into smaller units, say 3 songs instead of 6.
I need help to carry out this job, and would be grateful if you could help
Jean

#4 under tutorials.
http://manual.audacityteam.org/o/man/tutorial_copying_tapes_lps_or_minidiscs_to_cd.html

http://manual.audacityteam.org/o/man/splitting_a_recording_into_separate_tracks.html

Koz