I decided to carry on in the tutorial and several lines further, I found:this:
Point - Intersect XY
Point: A18, A22 ⇒ A22
Just as an ‘Aside’, I would like to make the observation tthat; it would be of enormous benefit to, @ least, N00bs such as myself, have the reasons for the placement of the ‘Points’ in the pattern. With that, I mean why a particular Point is to be set and what the reasoning is for using a particular dimension - this is especially of use for calculated dimensions, such as Crotch extensions Front & Back.
I appreciate that this may exceed the intended WiKi limits for the tutorial, but something of this nature, including links to information explaining these design and drafting techniques and practices would be of great help to those with less practical drafting and design experience.
This may also be something that @Grace might also be of help here?
Brgds, David D.
PS: I will be continuing with the tutorial and, should I trip over other anomalies, I will report back ‘here’.