Yes, you can create time/expense entries on behalf of another firm user.
OVERVIEW
This comes in handy for situations such as a paralegal entering time for an attorney. Even though the paralegal is entering the entry into MyCase, it should still be tied to the attorney, not the paralegal.
To do so:
Add a time/expense entry
Select the field: User
Select the name of the user in the dropdown menu that you would like to record time for
Fill in the remainder of the time entry/expense box
Save