how important is alma mater?

Hi again - no, I definitely wouldn't recommend that. You want to make a full case for how an MBA from Stern would benefit you personally and professionally, both inside and outside of the classroom (despite having studied business there as an undergrad). Stern is currently in the process of updating its questions for the upcoming application season, but last year's question was (multiple parts):

Why pursue an MBA (or dual degree) at this point in your life?
What actions have you taken to determine that NYU Stern is the best fit for your MBA experience?
What do you see yourself doing professionally upon graduation?

As you can see, in this topic (which has stayed the same for several years) they don't ask you to mention how you would divide your time, just how you'd spend it in general.

Best of luck!

i recalled the wrong school. this is a question from the new columbia application: Essay #2: The full-time MBA experience includes academics, recruiting and networking. What are your personal priorities and how do you anticipate allocating your time at Columbia Business School? (250 Words)

Ok, thanks for clarifying. While you might put more emphasis around recruiting and networking, I'd still recommend highlighting a CBS-specific academic resource that you haven't yet been exposed to, just so that they're aware that you're planning to take full advantage of the program (and I wouldn't go so far as to say that you've already taken a lot of business classses in undergrad so you'll be less focused on academics - the AdCom also wants to make sure you'll be engaged in the classroom). Hope that helps!