You can add an Output column.
Procedure
Open a DMN decision table.
Click Add Output.
Click the Output column header.
Click Configure column. The dialog opens.
Enter a name.
Specify a data type. You can create a new object of type Item definition or use an already existing.
You have added an Output column.
Tip
Click F2 to open the dialog. Use the Tab key and the arrow keys to specify a data type. Make your entries and press Enter.