[Answer]-Use an git repo from an existing app with a new app in openshift

From your command line, you can type in rhc apps to get all the info about your existing apps – including the git URL.

Here is the page in the documentation if you want to see it: https://access.redhat.com/site/documentation/en-US/OpenShift_Online/2.0/html/User_Guide/Viewing_Applications_for_a_User.html

You might also be interested in the article on cloning an existing application.

This StackOverflow post also includes instructions for using an existing git repo for a new app on OpenShift. I haven’t tried it myself yet, but it looks promising. (The relevant info is in the first answer, but it’s down a little ways, so you’ll need to skim to find it.)