How to import external groovy program

Hi all,

I am new to SOAP UI.
I've setup a test suite for REST services. Each test step contains a groovy file to compare the result. I want a particular functionality, which i written as a separate groovy file. I want to access that in each steps.
1. How to import/access that function in each steps ?
2. Is there any ways to make that groovy file as a global and make it accessible in each steps.

Thanks in advance.