The chart has to have proper section markers. Here's a tutorial I made on creating them:
viewtopic.php?f=3&t=7236Previously, I found that FoFiX required at least two section markers to let you select which one to start from in practice mode, they may or may not have fixed that limitation, so you'll have to try it out. EOF is pretty much guaranteed to make usable section markers, Feedback may or may not work, Fruity Loops will not work (no text event support), but real MIDI editors like Anvil Studio or Reaper should work.