Importing Selected Options

This is a pre-sale question regarding this plugin.

We basically need an option to be able to import the different options into for example drop-down options. It is going to be for a school system.

So a province is going to be selected, from their choice they have chosen a selected set of schools in that province will then be selected. Now there is going to be over 18 000 schools for this system. Is it possible?

So when choosing to select a drop-down field, to then import the various options of schools? Not entering in each option one for one?

Thank You
Look forward to hearing from you!