You can mass edit the user rate for specific Projects.
Mass editing the user's hourly rate in the list view.
- If the User Hourly Billing rate is non-editable in your org, follow the instructions below to make it editable
- Go to Setup and search for the TT detail object and click it,
- From Fields and Relationship, search for "User Hourly Billing rate" and click it
- Click the "View Field Accessibility" button
- From the fields list, search for "User Hourly Billing Rate",
- Select the Editable field for your profile,
- Enable the Check-box Visible field and save it.
- Now you can edit the User Hourly Billing rate in the list view