What kind of analysis are you doing? I suspect that you could do this with envlp analysis - but to be honest, you've not given much info as to what you're trying to simulate or how you're trying to simulate it.
In reply to Andrew Beckett:
In reply to praveenmv:
Don't know, sorry. Maybe somebody else can answer this (I might be able to make a suggestion if I was more familiar with the details of your system). Perhaps contacting customer support for advice would be a good idea, then we can take a look at what you're doing in more detail?