Kevin, if you're running all DCS fixed voltage tracks, it's a easy to divide your track into 3 or 4 TIU outputs with 3 or 4 input sources. You do not have to remove any track. What track are you using?
If your track has conducting pins between center rails, cut the pins with Dremel cutoff wheel and insert a little hot glue at the base of the tie to keep tracks isolated. Other tracks can also be isolated from above. You may have to be a little more creative.
To add more wiring taps to the new division, solder from above.
For track with plastic roadbed, this page may be helpful.
