the number of units is not editable when it is linked to an appointment by design. You'd need to add it as a line item instead so you can edit the number of units. This creates a challenge as we are unable to adjust quantity to reflect number of hours per session. The fee needs to be calculated as a total and inserted. To manually enter service is a hectic job specially when invoice includes many sessions. For insurance and regulatory bodies invoices as such in ontario not accepted as the service price point per hr should be included.