I would like to find out if there is a way to convert or upgrade a student edition licence for business use?
There isn't any way to switch or transfer the plans.
However, you will need to get the student-teacher license cancelled first (Cancel your Creative Cloud membership)
Then sign up for the business plan using the same Adobe ID if you wish. (Creative Cloud pricing and membership plans | Adobe Creative Cloud)
You are welcome!
P.S. when using Adobe forums, please mark helpful/correct responses of Staff/helper, if there are any.