Subqueries can be selected on any display that has a WHERE or HAVING clause.
To see the subquery display, press F9=Specify subquery when the cursor is on a WHERE or HAVING input line. A display appears that allows you to type in subselect information. If the cursor is within the parentheses of the subquery when F9 is pressed, the subquery information is filled in on the next display. If the cursor is outside the parentheses of the subquery, the next display is blank.