Once again, this is intended for my Flat Pattern students. If you are someone else’s student, do whatever your teacher tells you.
This sample problem illustrates several of the things that we can do with darts other than just moving them around. We can choose to make one dart into several close-together darts (a “dart cluster” in your text). We can also choose to have darts only sewn part way down, rather than completely closed (a “tuck-dart” in your text), which allows the remainder of the dart uptake to be released as ease. This is a design decision. There are rules for how we manipulate one dart into a cluster. These are on pages 103 – 109 of your text. There are also rules for how we mark tucks. Some of these are in your text, some are not.
Per your text, for industrial production we would mark drill holes 1/8″ inside the top leg, and on the center line. Both of these drill holes should be 1/8″ before the desired end-of-stitching point. Pattern drafting software marks these in a similar fashion, although you can specify the distance.
Think about men’s suit coats. If you’ve seen one with stripes, you might have noticed how those stripes are straight up and down at the waist of the coat, but they lean in to the neck over the chest. That’s a very good example of a grainline that runs just like this one. (Some times it’s exaggerated if there’s a dart at the neckline for fit.)