loadcase(LABOURFORCE_DICT,prevround) then //load previous round
RNDNO = tonumber(curid[1:2]); //change round number (an id field) to current round
writecase(LABOURFORCE_DICT);
But that results in the case being duplicated. Doing this with any other field seems to work
You have two options, using data entry as you already are or using a batch application.
Using data entry you'll:
loadcase
delcase
writecase
The easier option is to write a batch application which allow you have a input and output file. You'll simply identify the cases and modify them and they'll be written to your outputfile.