OK, in that particular case, using subdecks is not appropiate. Open the deck, then
- Browser > Fields > Rank > Sort by this field in the browser
- Browser > Click on “Sort field” column. Now all cards are ordered by “Rank” field
- Select all cards > Right button > Reposition. Now the due value correspond to the “Rank” field.
- Start studying using your deck options. It should work now.