Hello there, @s-slabotsky-gmai. Does the business reporting center refer to Class or Location tracking? When you say "Busauto expense won't let you choose business reporting center," do you mean the fields are missing or greyed out? Clarifying this will help us find the root cause and solution.
If you're referring to Class or Location, make sure to turn on Track classes or Track locations in your Account and settings to enable expense tracking.
Go to the Gear icon> Account and settings> Advanced tab. Scroll down until you find the Categories section, then select Edit, toggle the switch On, and click Save.
Ensure your user permission allows you to edit or change the business reporting center.
For any further questions or clarifications, leave a comment below.