I don't entirely follow your question. On the off-chance this is what you're asking, if you're playing a scale, like E major (doesn't matter whether it's the 7 note version (diatonic) or 5 note version (pentatonic), the principle is the same), you have 7 chords that are built from that scale. You can play any note in that scale over any of those 7 chords and it will sound fine. Some will work better than others, but nothing will sound "wrong".
If you want to move to the second degree of that E major scale, so you're starting on the F#, you can use the same chords, as you haven't changed key.
You would only need to create new chords if you started playing F# major scale.
Again, not entirely sure I'm answering your question, but hope that helps.