Scenario:
The Web TimeSheet administrator wants his supervisors to receive individual notification e-mails for each timesheet waiting for their approval. However, he wants the client approver to receive a single e-mail notification listing all the timesheets waiting for his or her approval.

Resolution:
First set up a timesheet approval path as specified below, then enable the following e-mail notifications specific to supervisor user and external user.

Approval sequence:
Supervisor = Approval sequence 1
Client = Approval sequence 2

Enable Timesheet is waiting for approval e-mail notification for Supervisor

Enable Timesheets are waiting for approval (Batch) e-mail notification for Client/External user