Pass Variable into Process Start Smart Service


I would like to be able to pass a variable into Process Start Smart Service. 

How I can do this. Some people probably will say that in this case Cannot be passed by reference. But I need to pass it. Using Sub Process does not allow me to start process based on a Decision table. I have to always select only one process. So this is why I need to make this work. 

Any help will be appreciated. 

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