If you receive the error message: We're sorry. This feature is not included in your QuickBooks Online subscription. this is because you are trying to import either a field or transaction type that is not included in your current QuickBooks Online subscription.
The most common fields/transaction types that we see users trying to import that are not included in their QuickBooks Online Subscription:
Bills and Bill Payments: As a workaround you can import checks. If you need bills and bill payments upgrade your QuickBooks Online subscription to Essentials or Plus.
Class and Location (Division): If you need access to these fields you need to upgrade to QuickBooks Online Plus.
You can read more about all the features in each version on the Intuit website
Just be sure you do your homework as there is no way to downgrade a subscription.