How to use the ad hoc parameter builder
For a field that supports typing an ad hoc value, you can type the value and use the ad hoc parameter builder to choose from a list of operators and characters to provide a QBE expression in the field.
1 Choose the builder button to the right of the parameter value field’s drop-down list. Figure 3-5 shows the menu that appears.Figure 3-5 The ad hoc expression builder
3 To type text, reposition the insertion point in the field, or repeat steps 1 and 2 to choose another item. Figure 3-6 shows the result of adding two pipe signs (|) and typing several values. The resulting QBE expression specifies that the values must match 'A', 'B', or 'S'.Figure 3-6 A QBE expression on the requester page