2020.10.1 - We hope you're having a great start to the week! We've just rolled out 2020.10.1 which includes an enhancement several bug fixes to billable items as well as the ability to add additional fields and metadata via Custom Fields.
We'll be looking to improve the usability of the data captured in billable item custom fields in the coming weeks, but we thought it was important to get this feature out there to at least allow data to be captured.
Happy Scheduling!