You can add an item by clicking the Add Item button from the left sidebar of the Edit screen. The Edit dialog will allow you to change the date, quantity or the item/category itself. You can also supply or remove a discount code, or override the total.
To change the item, select a new one from the drop-down menu. This will search the system for items based on the parameters supplied. If there are other items available, they will appear in the list and allow you to select one. If you only wish to see items that have availability, check the box labeled Hide unavailable items.
Selecting a new item and changing the quantity or date will automatically query the system and return a new price. If there is a conflict, an error message will appear. When a booking has been modified, a new balance will be calculated and show on the invoice. If necessary the booking status will be also be changed.
To remove an item from the invoice, click on the Change button as mentioned above, then the red Remove from Invoice button. If the item you're removing has packaged items attached to it, the package contents will be removed as well.
If a payment has already been collected on the invoice, removing the item does not automatically refund it. You need to do so via the Transactions link above the invoice.
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