Hi there, @Arbooks1.
Currently, QuickBooks Online (QBO) doesn't have a step-by-step user guide for syncing data from ADP TotalSource, since QBO is dependent on the data provided by ADP.
You can, however, search for it in the Integrations menu in QBO and then Find integrations.

Another way around is to directly contact the ADP TotalSource team to seek comprehensive guidance on how to sync their data with QuickBooks.
Don't hesitate to return here if you have additional questions.