How do you make a pants pattern pant pattern making formula winda cad software

How do you make a pants pattern?
And then you'll be good to go and make some awesome pants. Alright so the final adjustment that i'm going to make to my pattern pieces of my pants is going to be concerning.
Now you can draw the waistline: calculate ½ waist measurement/2 + 1.5cm for the front, and ½ waist measurement/2 + 0.5cm for the back. For example: 37cm/2 = 18.5cm +1.5cm = 20cm (front) and 37cm/2 = 18.5cm + 0.5cm = 19cm (back). These measurements take into account a 2cm wide dart that will be placed at the back.