Niko on 28 Mar, 2018 09:29 AM
Thank you for your suggestion and feedback!
I am currently working on a major update to Timelime. (Most likely a whole new app in the App Store.)
One of the new features is the ability to mark every timing as billed (=invoiced) and paid. Each Task can be marked as billable/unbillable. Certainly you will be able to filter timings based on these tags.
I have implemented all of this already. It will be available with the new version.