Hi, I think you can try the following 2 lines in LabTalk:
wreducerows irng:=col(15) nrows:=14 start:=2 orng:=col(19);
wreducerows irng:=col(17) nrows:=14 start:=2 orng:=col(20);
-Edit-
Sorry... didn't notice you use O8. Perhaps wreducerows does not exist in O8. You can use "reduce" instead:
reduce irng:=col(15) num:=15 method:=minrow orng:=col(19);
reduce irng:=col(17) num:=15 method:=minrow orng:=col(20);