Split a 500 page merge into about 23 documents

[documentimpossible]

I've read and tested the suggested split but they seem to be designed to split into individual docs, I've got about 500 labels and they're a bit unwieldy as a single document, they'd be best split into each location (roughly 23) which can be determined each time that location field changes, which would also be the file name, is anyone able to help? Thanks