No. As of now, CORE does not support real-time syncing of records. If you make changes to records in CORE that you have synced with QuickBooks Online, you need to sync them again to update them there or do that manually. You also need to make sure that the option If record exists, overwrite is not set to Never in QuickBooks Sync Detail > Sync Settings > Send. Otherwise, the record does not update. You can also choose to only send data to QuickBooks and not get anything. Being an on-demand feature, you have to manually sync the data. So you can choose to make it a one-way sync by not using the Get option at all. Just use the Send sync settings and menu in CORE. Check CORE Help Center for details.