@MFS-LB
Good Morning! Classes will import to QBO as long as you are importing to a version of QBO which supports classes. Those versions are currently QuickBooks Online Plus and QuickBooks Online Advanced. All of your current information including Chart of Accounts, names lists, transactions should import. There are a few exceptions to what will not convert which you can review in this resource: https://quickbooks.intuit.com/learn-support/en-us/help-article/import-export-data-files/expect-switc....
You can either rework your chart of accounts prior to conversion or after the conversion directly in the chart of accounts in QBO.
