You can only set up a regular pension in QuickBooks Online (QBO) Payroll Core, bookkeeper. The feature to set up salary sacrifice pension is only available in Advanced payroll. I'd be glad to provide more details below.
To set up a salary sacrifice pension, consider upgrading to Payroll Advanced. For more details, check out this article: Upgrade or downgrade your QuickBooks Payroll plan.
In case you've upgraded your payroll subscription, you can visit this link for future guidance in setting up a salary sacrifice pension and managing advanced payroll:
Please remember that I'm here to offer guidance whenever you require assistance setting up your salary sacrifice or other payroll concerns. Post your questions below, and I'll be glad to respond.