I believe that if all you want to do is extend lifetime, you can do it with CSV updates to the fixed asset record (as well as alternate depreciation records, if you have any). But the impact is that NS recalculates the go-forward monthly depreciation based on the method and doesn’t ALWAYS take the previous depreciation into account which can lead to a surprise catchup entry at the end…hope that makes sense, but if you have a sandbox I’d recommend just testing a CSV import to update depreciation end date and watch what happens to the depreciation schedule.