Feb Actuals divided in half to import to Jan

There was no Jan close, so we want to divide Feb actuals by 2 to get a Jan actuals load.  The loads are SQL from HFM and Database Whse, so it isn't done with a flat file csv.  When I looked at the Feb Import that are 1214 lines.  How can we take that Feb import, divide by 2, and import in Jan Actuals?  First thought was to create a QuickView then upload back into OneStream.  Also looked at a copy Business Rule but calculations are needed for the data.  Any ideas/thoughts?