Besides using a formal table (probably the better option) - is there a reason why you can't just specify a sufficiently large range, say a 1000 rows?sometimes more rows of data are added so i need to adjust L111 to , say L130
=SUMPRODUCT(SUMIF($K$5:$K$1000,{"*C","*S","*P"},L$5:L$1000),{100,1,-200})
Besides using a formal table (probably the better option) - is there a reason why you can't just specify a sufficiently large range, say a 1000 rows?
FWIW, you can also write your formula a little more succinctly, like this.
Excel Formula:=SUMPRODUCT(SUMIF($K$5:$K$1000,{"*C","*S","*P"},L$5:L$1000),{100,1,-200})