Path: Transactions > Work Order > Records / Identity–Tasks Subtab
By default, trades are not required to save a work order; however, many Task Types (established in Organization > Lookups) have a default trade. This is why, when you add a task to the Add Task popup window, a trade is automatically added to the window. You can delete the default trade and add a different trade or have no trade at all. As a rule, trades are added or removed at the time you add a task.
To add a trade to a work order: