The dialog appears when you right-click a table or a table column and select Insert > Detail Column from the shortcut menu. It helps you to insert new detail columns into a table. See the dialog.
Resources
Lists all the available data resources for the new detail column. Select the resource you want from the list.
OK
Inserts the column with the specified resource and closes the dialog.
Cancel
Does not retain any changes and closes the dialog.
Help
Displays this help document.