mass editing classifications in company database

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I am setting up our company contact database in SCM.  Are there any tips for mass-editing the classifications for each company?  I have used the Assign Classification function in the Action menu, but I have to sort through the entire 1500 company database. I tried filtering the list before clicking on Assign Classification, but it takes me straight back to the full entire list.  I don't see a pre-set up excel spreadsheet for importing classifications either.