If you had used the built-in "archive and delete" option, you could automatically re-import any or all of the prior data. That's how I do it each year - that cleans out the old data and puts it in the archive files.
Not sure if this same function would work on a "non-archive" file since the database structure changes over time so the old data files become incompatible with the new data files unless they are converted. When ever there is an update to AW, both the live and archived data files are converted together to avoid this problem.
At least this is how I've come to understand things.
I would guess that there is a more technical utility program or function that could merge different formatted data, but if might be a very manual and tedious process.
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