Not sure what a column in Dispatch Planner means? This reference lists every column in the Trips and Drivers/Assets tables, with a link to each one's full definition.
The full guide covers:
Trips table columns: trip, pickup, delivery, freight, miles, rates, assignment, and tracking
Drivers/Assets table columns
Which columns are on by default
Also known as: dispatch planner columns, column definitions, available, available at, cycle time, hours of service, HOS columns.