Michelle, I don't see with your explanation which value you put in each steps.
Perhaps you could get inspired from the tutorial video CP-04 that show how to setup cPanel for a subdomain and also how to setup JMS Multisites with a subdomain.
www.jms2win.com/tutorial#jms12x-CP-04
If you want to replicate a master website, you have to create a JMS Template rule that provide in input the "template site" = master.
See tutorial video 0.d that present a sample on how to replicate the master.
This is moreless at the middle of the video - rule = replicMaster
www.jms2win.com/tutorial#jms12x-0d