I have loaded a category named "Rag Hands". I need to know how many times I have played a hand of that category UTG, for example.
How do I acomplish that?
You can't do that exactly, but you can select the category row, then in the bottom data section you can sort the data by the OTB field to see the results in order by position so at least they'll all be grouped together. However, while the button (OTB = 0) and cutoff (OTB = 1) are easy to identify, UTG is not because that is a relative position number based on how many players were in the hand.
Unique hands means hand patterns ignoring suites? Like Ac Ah Ks Kh is the same unique hand as Ac Ah Ks Kd?
Yes.