If you have created new payment options in the BackOffice, and now want to map them with QBO, you would have to first create a new Payment Option in QBO itself. You may refer to the below steps on how to do that.
In QBO, from the home page screen > company gear (upper right corner) > Lists > All Lists > Payment Methods > Add New Payment Methods > Save.
Once you have clicked Save, you will see the new payment method added into the list.
Now, go back to your StoreHub BackOffice > Settings > Add-Ons > Click on 'Reload Settings from QBO' > and then the newly added payment option in QBO should now appear in the list for you to select.
And you're done! Now you just have to continue with the Tax Codes Mapping, Accounts Mapping & Products Mapping.