To assign a value to a COBOL field

From the Interface Mapper Linkage Section pane, drag a field to the COBOL Assignments pane.
In the Value field, type a literal value to assign to the field specified in the Name field.

Note:

If you drag a group field, the COBOL Assignment dialog box opens for each elementary item in turn. You can click Cancel if you do not want to set values for all of them.
You can also create a COBOL Assignment field by right-clicking in the COBOL Assignments pane and selecting New Assignment from the context menu.