ZBrushCentral

Help me with new curve mode in Zbrush 4r7

here is a link: http://pixologic.com/zclassroom/homeroom/lesson/military-assets-with-joseph-drust
here is the name of tutorial: Creating a “Molle” Insert Mesh Curve Brush Part 2
My problem is that i can not do step by step because one of the steps do not work any more i new Zbrush 4r7. And the step is when remove some of lines so he has one line on top one line on bottom. Can any one help how to solve that in Zbrush 4r7 ? please