As far as I see, it would be really complicated if even impossible to achieve what I think you want following my approach. There is only one total column for the context / position you need, so the only possibility I see is either concatenating your different values (maybe separated by a delimiter / line break) in the single one total expresssion, or using a different approach (which I haven't time to think about right now).
You might want to open a new thread for this new problem, so you also get more attention from others.
