Hobby license transition to startup advice. New account or existing?

[sthompsonJBGKZ]

Hello. Apologies if this exists somewhere here, I searched but didn't really get clarity.

I have been using Fusion360 as a hobbyist for a couple of years, mostly for personal 3D printing stuff and designs for Home/DIY/Woodworking projects. I recently have been asked to work with someone who has a business selling products and he just got approved for a startup license and purchased two seats.

I will be doing most of his designs (he has no Fusion360 experience). I currently have a lot of designs in my current hobby account. I want to make sure that, if this relationship doesn't work out, that I can return to my hobby activities.

What is the best approach to move to the startup/commercial version? Should I make a new account and join that and keep my personal account separate? Or is it ok for him to use my existing account to "invite a user". I have a lot of existing designs that I learned on that would be helpful to have available. If I do that, could I return that account to a hobby license if need be?