You can add columns to a form: you can restore columns you have deleted or add columns after you have modified the data source to include more columns.
To add a column to a form:
Click the Column button in the Controls drop-down toolbar, or select Insert>Column from the menu bar.
Click where you want to place the column.
The Select Column dialog box displays, listing columns not currently in the form.
Select the column and click OK.
The column is added. No header or label is added, but you can create a header or label by adding a text control to the form.
