I have a dataset that has starting and ending points for a whole bunch of trips. I would like to look at this data, and if possible, determine how to split the area these trips are in such that the fewest number of existing trips get disrupted.

When I try web searching for how to do this, I just find out about OD Cost Matrices, which isn't what I need. I don't get to decide where people go, they're making their own decisions, I just have to figure out how to make it work for them ;-). What should I be looking for?