Hi,
i think what you are looking for is called "Intermediate Forwarding" in the splunk world. Look at this little section in the docs: link
There is not much documentation for this setup, but there are already some questions regarding this. For example:
http://answers.splunk.com/answers/10429/is-there-an-example-configuration-available-for-an-intermediate-forwarding-configuration.html
http://answers.splunk.com/answers/32446/universal-forwarder-is-not-working-as-an-intermediate-forwarder.html
Greetings
Tom
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