Install plug-in 'Multiple SCMs plugin' and setup your repositories:
- Repository URL
- Credentials Click on 'Advance' button
- Name: provide name as 1st repository origin, 2nd origin1 and so on. You can provide any unique name
- Check out to a sub-directory i.e. local subdirectory for repo (directory on your system in which you want your repo to be checked out)
- Custom SCM name
Set up all your repos similar to above steps. Attaching screen shot of my jenkins configuration.