We’re setting up our ski club trip signups and invoicing in WA for the first time. Some options we need to create have negative costs, like a lift-ticket discount for a senior or a “ground package” discount for someone providing their own transportation to the resort. WA will allow us to manually enter a negative-cost amount on an invoice, but will apparently NOT let us create a custom field that has a negative cost. It would be a tremendously helpful enhancement if we could create a negative-cost item (under Custom Fields). Please consider adding this capability – or perhaps it exists but it’s not apparent how to do it? Thanks!