How do i prepare requests with repeated blocks having unique number in each blocks ?

Here is an example of how to modify xml request using groovy

def groovyUtils = new com.eviware.soapui.support.GroovyUtils( context )  

// get XmlHolder for request message def 
holder = groovyUtils.getXmlHolder( "login#Request" ) 

// change password using XPath 
holder["//username"] = "test"  

// write updated request back to teststep 
holder.updateProperty()
context.requestContent = holder.xml

 taken from

https://www.soapui.org/scripting-properties/tips-tricks.html

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