Categories in To Do Android

I have categories called "Priority 1", "Priority 2", etc.  I put my tasks into those categories based on importance and move them within a category by importance too.  This view works perfectly in Outlook on Windows.  But when I go to the To Do app on Android, I can find no way to get the same view.  Grouping by Category is a start, and then keeping the same order within the category is required too.  What's the point of a mobile app if it doesn't work the same as Windows?