yes this is a pro only feature
SoapUI Pro adds the possibility to have a central library of Groovy Classes that can be accessed from any script within SoapUI, which can be useful for centralizing common tasks and functionality and for creating SoapUI extensions. Use as follows;
In the open source version, you can compile your groovy scripts (
http://groovy.codehaus.org/Compiling+Groovy) and put them in the jar.
Then put the jar in the soapui ext folder to make the classes available to any script within SoapUI
