TimeTrex Time and Attendance

What I would like to do is put an employee on a schedule where they do not have an assigned time. I have two examples. One I may want to have someone as a call-in but not actually have them schedule to come in. This is in the case where I may expect that we have a larger number of orders and may need the extra labor. Two I have delivery drivers that are scheduled to work certain days but are not assigned times until the day before when I know when I want them to start. This is based on the number of orders. Is it possible to put someone on the schedule without a start and finish time?

You could create an absence policy and use it as that. It does not display a set time and are not actually scheduled a slot. Just marked in the schedule as "Call-In" for examlple.