There has been a lot of requests for this feature in OYE. Unfortunately OYE doesn't have any custom <noindex> tag to avoid crawling in the current version.
But there is a work around, which is you can have the dynamic content as a PHP include and name the OYE user-agent to something specific. Then in PHP depending on the "user-agent" you can deny displaying the content to the crawler if it matches that "user-agent".
Simple SSI includes are impossible to hide from the crawler as Apache pre-processes the SSI request internally.Update: I take back what i said, just found a work around in SSI:
All you will have to do is to name "User-agent" to "IBM-Omnifind" in the OYE admin tool under
Collections>Web Crawler>Related Tasks>Edit crawler settingsAnd then add the following conditional code in your SSI
<!--#if expr="${HTTP_USER_AGENT} = /IBM-Omnifind/"-->
<!-- Dont display anything -->
<!--#else -->
Insert the dynamic SSI content here
<!--#endif -->
A similar thread can be found here
http://omnifind.ibm.yahoo.net/forums/index.php/topic,514.msg3143.html#msg3143