It goes after the resident load like you have it:
NoConcatenate Load *
where PROD_DT = '07/31/2014';
This will create synthetic keys since the fields you are loading in are the same as the AllData table (notice the noconcatenate keyword to prevent the tables from joining). You'll after to worry about how it will link (or won't link) to your data. Maybe as simple as just changing the field names in PreviousData to something different or using qualify.
Hope this helps!