Reports - Literal Text and Literal Numeric Columns
Each top level table in reports has a "New Literal Numeric Field" and a "New Literal Text Field" in the Fields list.
These are useful when every row in a report needs to contain a static number or some static text. For example, when a funder requires every row to contain your agency ID number, or a column that displays "Not applicable" or "Foo" for a field you don't collect, but is required to be a column on a report you submit.
The column properties for each field contains an Expression box where you can enter the text, or number, to be displayed. In this example, the column will display "Data not collected" on every row of the report. In real life you would also change the Heading.