"Business Type" is a setting you select in the interview process, to give you two things:
Starting setup <== this is all in your file now, you add, delete, rename and refine
Tax line mapping <== this is based on the business Tax entity Type
There is no "going back" to the Interview. It controls Nothing. Everything is in your file.
If the issue is the Tax line Mapping, which is only a function of "I intend to import this QB data file into Turbo Tax or one of the other Intuit professional tax preparer programs" and it bothers you that it is the wrong tax form, you go to Company menu > My Company (or, it might show as Company Info; they keep changing the wording) and top right is a Pencil Tip = Edit. Change the Tax Mapping here for the Tax Entity type.
