Is there a column for Margin Req

Not directly, by any means that I am able to ascertain. We have a very limited number of functions that can access data relating to our portfolio. You can read about them here: http://tlc.thinkorswim.com/center/reference/thinkScript/Functions/Portfolio.html

Unless there is a way to compute the margin requirement from the available functions I don’t see a way to get there. I personally don’t have a clue how Margin requirement is computed. So perhaps one of our other viewers can enlighten me on the topic so I can investigate further.