how to pass data one cfm to another cfm?

The same way one can pass info between any HTTP requests: FORM fields via post requests, and URL parameters via GET requests.  Or by saving data in cookies.

CF can also persist variables across requests in the session, application and [gulp] server scopes.

I suspect you need to doing a bit of reading up on how HTTP works, and how CF works.

CF links:

http://help.adobe.com/en_US/ColdFusion/9.0/Developing/WS8f0cc78011fffa71866534d11cdad96e4e-8000.html

http://help.adobe.com/en_US/ColdFusion/9.0/Developing/WSc3ff6d0ea77859461172e0811cbec22c24-7fd4.html

HTTP links:

http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol

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Adam