A select-at-takeoff item in an assembly acts as a placeholder for an item that varies from job to job. This allows you to set up an assembly that prompts for an item selection during takeoff. You can also specify a default selection to be used at takeoff.

For example, you could set up a paving assembly without specifying the grade of asphalt. Later when you take off that assembly for a particular job, you can choose the appropriate kind of paving.