Nick here from Shopify. I made your reply it's own topic as it merited one!
It is possible to change your EIN number, but it is something that our team will need to look into and review. Because of this, the only way forward is to reach out to you by email directly to verify your store details. Some things to remember is that it must be the account owner, If a staff member is asking to update the details, it's not possible and must be the account owner. If you could also have the reason for this preparation. You mentioned recently established a new business which makes sense for this.
If for any reason you didn't get an email, please let me know!
All the best, Nick
Thanks for getting back to me @lapadula.
I edited your post to remove the details so they are not public. I got your email and have sent your ticket to the correct team to review. Once they have an update they will be in touch with you directly via email. It can take a few days to review though, but someone will be in touch.