I didn't give you a menu option for notches. I should have done that.
All they are is points with color formatting. When I create them, I generally use the Add Point on Line function and measure down from the armpit, for example. I use the same measurement on the front and back patterns so they match. You can use the same process for curves for marking the armhole notches.
I'll put notches on the to-do list for the Fashioner. Thanks for asking.