Update multiple records at one in Deluge

Update multiple records at one in Deluge

 Is there anyway to get Deluge to update multiple records at once.

A record in Table A has multiple records in Table B.  Some data from Table A is replicated to Table B to speed performance.  When Table A changes, I need to update all the records in Table B.  This does not work

                   Fetched_Records = Table_B[Key = TableA.key];
                   Fetched_Records.Field_to_Update = TableA.New_Field_Value;

Other than iterating every record with a "for each matching_records in TableB" is there a way to do this?

Thanks!