If you want to make changes to many time entries at once, you can do that on any Time entries screen in your Productive account.
In the example below, we are editing time entries on budget level.
First things first, click on the checkbox on any individual time entry, to open up the multiple select option.
As soon as you select any time entry, a black footer will pop up. There are four options to choose from:
Project - move time entries to a different project
Service - this will allow you to move all selected time entries to a different service on the same budget
Person - move time entries to a different person on that project
Billable time - change the billable amount for many time entries at once
There's also a fourth option, hidden under the "3 dots" on the right side of the footer. This will open up the delete functionality, which will allow you to delete all selected time entries.