Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

To lengthen a pattern piece for sewing a garment, cut the paper pattern where indicated. It will normally state "lengthen or shorten here". Open the cut to the desired amount you need to add to your pattern. Place a piece of tissue paper underneath and tape in place. Keep the grain line correct and even. Make sure you do this to all your pattern pieces used for the garment.