In my case, my plan is employer sponsored and my roth and traditional contributions go into the same account, so there's no way for me to say which holding corresponds to pre-tax vs after-tax vs Roth as they are all in the same pile -- it is possible, however, to determine and track the % pre-tax, % after-tax, and % Roth of the entire account as a whole, which is why I'm wondering about my original question.
