Noob question on out arguments

Hi, I am trying to assign a variable to an ‘out’ argument from an invoked workflow. I cannot find the out argument when I use the Assign activity. Does this mean that in order to extract the value from the out argument, I have to use the Edit Arguments dialog box?

I know how to pass ‘in’ arguments to the workflow via Edit Arguments, I am just not sure if it works the inverse way for out arguments…

e.g. I have an out argument out_dt, i want to store it as extractedDt. I cannot find out_dt anywhere when I use Assign activity

You can’t use assign for arguments, instead in the argument window, mention the variable name in the value column