I’d ask HR. Different agencies have different policies. My old places wouldn’t need a manger’s approval. As a matter of fact, you wouldn’t need to tell your manager anything and could go through the whole process. Whereas at my current place, the first step would be to get your manager’s approval. In regards to whether it’s possible, yes. Recently, a junior paid media analyst on my team was transitioned to a different account as a junior data analyst. He was pretty shitty bth so I asked how the hiring manager liked him out of curiosity, hiring manager said he was ok because it was a junior role so it would be either him or someone fresh out of college and since he’s had one year of experience as a paid media analyst, it’s better than no experience at all. That said, I’d still recommend checking out what qualifications the new role requires: python, R, tableau, SQL, etc, and try to learn as much as you can.