Unpaid leave

We have employees who can take unpaid leave.  But there is no category for this item.  Wages are set up as standard.  Apparently employees can now take x amount of weeks as unpaid personal leave. How do I record the hours taken as unpaid leave without any dollars shown.  Apparently am supposed to keep track of the unpaid hours taken.  I  tried to set up for for when available in Pandemic leave (fortunately didn't need to use then) but it wouldn't accept an item without zero dollars against it but I still need to show show many hours unpaid leave taken, and to have this detail shown on their pay slip. Also as a category for unpaid leave do not want sick/holiday leave accruals to accumulate on that item either.  How do I create this entry?

Thanks in advance

Rob