Yes, that's what I would do. However without really knowing what is in the import (records & fields) it is quite difficult to say what will work best in your solution.
Typically a Quarterly financial report could have individual transactions along with sub-summary lines as well grand summary lines too. If that's the case, you may not want to do it this way. In fact doing it that way may actually hinder other reporting. For instance, what if you wanted to do a month report?
Having a data sample might be best to be able to get the best advice for your situation.