Courses entered for 2016-2017 should populate into 2017-2018 when downloading from search each year.

We're currently tracking a feature to add in the near(ish) future that will let you import an old IPA schedule into a new one.

In the meantime, you can somewhat work around this problem by using the 'mass import from Banner' option in the Courses page toolbar to mass add courses of a certain subject code from a previous academic year.