Yes, whenever you need to change needle sizes just knit from the old size needle onto the new size and you're good to go!!!
Great thing about interchangable needles is you just change the tips to the new size.
(Once I made the mistake of only changing one needle, so I had a sleeve knit on size 7 on the right side rows and size 5 on the wrong side rows. I was all :doh: :wall: :doh: :wall: , but I made sure I did the second sleeve EXACTLY the same way so they matched, and no-one could tell.) :happydance: :cheering: :happydance: :cheering: