Hi Jen,
There as ongoing effort to improve our documentation around our customization module. I think the best way to get more knowledge and best practices around it is to join our Advanced Configuration Office hours webinar that our team hosts 3 times a week - you can register here: http://www.clarizen.com/live-demo.html
Regarding to your specific question - every time you create a new item, you can see it is being referred as NewObject1 (NewObject2,3....) and you can refer it on the subsequent actions.
Please let me know if you have any additional questions.
Regards,
Tamir