If you want a detailed answer, you are going to have to wait about a
week and half when I have more time. Here is what you need to do.
You need to clear the Chief's slots. If my memory serves me right,
check options 32 thru 36. One of them is labeled something like
clear roster, slots, or locos. If you are not using routes and
things, it won't hurt to clear them all.
To clear an option, flip the DCS100 to OPT. Using your DT100, hit
mode until a black dot appears under Switch. Then dial up the option
you want to change. Then press the c or t key. If you are not sure
whether to hit c or t, hit them both (one at a time).
Hopefully, this is enough info for you. Otherwise, you will need to
wait until I am done with final exams.