Hi - I agree with Vlad that it is not that easy and that it takes quite some time, but it's not as rare as you may think. I know dozen cases where it happened - typically:
- From Research Analyst to Business Analyst (or Junior Associate if the title exists within the Office)
- From Senior RA to Associate, and from Knowledge Specialist to practice-affiliated Associate
- From Senior Knowledge Expert to Expert Associate Principal
Now the common thread between those cases is that these all happen after one (or more) promotions *within* the research track. Say you join as a JRA, get designated RA, and nearing SRA designation you decide to choose client service and get designated BA instead. Same for a RA that gets promoted SRA and then decides to go as Associate instead.
If you have a client service skillset but from some reason choose the Research track and perform well it will get noticed by your evaluators - but the 1 year time frame is unrealistic indeed.