New status: Billed or Already billed or Archived

It would be nice if I could set time tracks to billed, already billed or archived.

I have several projects where the billing flexible based on milestones. I track my milestones and tasks in GitHub, but timetracking is in Clockify.

One milestone can be extends beyond weeks, months or years. For example it can be start on 2020. december and finished on 2021. april.

I want to keep all my time tracks on billable status until closing the milestone, and after I want to hide them, and see only not billed time tracks.