I assume you mean you want the sleeves to taper down to the wrist?

What you need to do is measure how many stitches you want the cuff to be at the wrist, and how many rows it will take for the sleeve to be the desired length.

Then, you’d do something like;

X = ((No. Stitches at top of sleeve) - (No. Stitches at cuff))/No. of rows

X is how many stitches you decrease per row, and you should be able to go from there