To ensure that your additional tracking categories in QuickBooks Time carry over to Karbon, re-sync your connection after you have added any additional custom fields in QuickBooks Time.
Navigate to Settings > Connected Apps > QuickBooks Time and click Save and Sync.
Once the sync completes, the additional custom fields created will be added in Karbon.
Need to setup Advanced Tracking in QuickBooks Time?
To install in QuickBooks Time, go to SET UP > Add-ons OR Feature Add-ons > Manage Add-ons. Under Get More, find Advanced Tracking and click Install.