There is an option in the Recon application in the folder with all the other local Casper apps that allows you to create a QuickAdd package.

As I learned from JAMF support guys this afternoon, do *not* try and redistribute a QuickAdd package downloaded from web enrollment, as that is unique to that specific request and will only work once.

I have created a Quickadd package via Recon. The moment I use it to enroll a second client, the first enrolled client disappears from the JSS database.
Any idea as to whats going on?
Thanks!