Question on load generation for each test step inLoadUI pro

Hello
I am new to LoadUIpro and got a question.
Question 1: I have 50 webservices to be tested and I have created one test case with 50 SOAP test requests in SOAP UI pro. Loaded the test case in LoadUIpro using the SOAPUI Runner component.I can see 50 Test steps ( So far good ).
Since each test step requires different requests/min, how do I achieve this in LoadUI pro? Because I have seen the generators dont give any info on what is the volume it going to give to a particular step.
Just trying to understand real time situation in which few services are consumed more and few less