I was reading about Modal jazz and there are scales within scales. Like A minor is in C major. It's a mode but it's the only one I know so I can't give other examples. But what other scales are their inside the Major scale (Please refer to their Relativity to C major to avoid confusion). The scales do not need all the notes of the scale. A good example would be C major pentatonic. C, D, E, G, A.