Darts registered within the program can take advantage of the Dart tools, such as moving them to a new location automatically. When you create darts from scratch, you'll want to register them so you can take advantage of all the tools. You'll use the Register Dart tool to do this.
In order to use the tool, you'll need to designate all the necessary points of a dart. To begin, you'll need to select the dart pivot point. On a bust dart, this would be the dart apex.
Next, you'll need to designate the point attached to the dart leg that will stay in place as the dart is folded. Typically, darts are folded to the side seams of the pattern, if they are vertical. They are folded down (with gravity) if they are horizontal.
In the example below, the side seam is the right side of the drawing. That means that the dart leg point on the right will stay in place and the dart leg point on the left will be folded over to meet it.
The next point to select is the point of the dart leg that will move during the fold over.
You will designate the fold direction of the dart by selecting the point to the right of the dart leg point that will stay in place. In this case, the point right (toward side seam) of the dart leg point that will stay.
Enter a name for your new dart.
The new dart will be registered. You'll see the dart legs drawn in for you. The information you gave regarding the folding of the dart (the stay point, move point and fold direction point) were used to generate a center point for cutting out the pattern.
After cutting out your pattern, always fold your darts closed to test the dart center point extension. Make any necessary adjustments before using the pattern to cut your fabric.