Add a column
Click Add Column at the right end of the header row (⌘L), or right-click a header to insert one beside it. Pick a processor from the pane, by category or through the search box, fill in its settings, and click Add To Grid. Every processor is cataloged under Processors.
Reference other columns
Type/ in any of a processor’s input fields to insert a column. A picker opens listing your columns, each with a preview of its value, and the one you choose drops in as a chip. Columns that hold rich objects let you drill in and pick a single field.

Control when a column runs
Open Run Settings in the column’s settings to run it only when a condition is true. The condition works like a Python expression, for example${revenue} > 1000, and you insert columns into it with / just like anywhere else. Rows where the condition is false show the Skipped status and cost nothing.
To try several sources in order and keep the first result, use the Waterfall processor, see Advanced processors.

