I make a master sketch for a truss design. It can consists 4,6,8 webs. I want to automate these webs so that when I give command it will create truss with 4 or 6 or 8 webs.But I don't how to make this 4,6 or 8 webs.I create a master sketch which has upper truss and lower truss (equal length).Two truss distance which is width.I made sketch for half of the length in sketch design.Is there any way that I can automate sketch? How to automate with non-linear pattern?

how can I automate web4,web6 and web8?