As long as your "prior period" is not before a period close or your beginning numbers, then yes.  You can run depreciation back to the month before the month you want on an asset or group of assets, then run depreciation forward to the month that you want to get NBV.  For instance, let's say that you have already run depreciation through the month of June 2013, and your period close was last done at the end of Dec 2012, but you want NBV as of April 2013.  Select the assets in question, run depreciation back to March 2013.  Then run depreciation forward for one month.  All reports will reflect amounts as of the month of April.