Action Chains > Add/Modify Chains:
It will be empty, so press the + button to add a new row. Double-click the Title row, type in a title, and then click the gear button that appears.
Click the + button, select Single-Field Edit, and then press the gear button:
Select the column you want modified from the dropdown list, then press the Template radio-button and click Add Template. This opens the template editor.
You may need to change the template to use your own custom columns. Pay attention to the Value with the book titles for any errors.
Then press 'Ok' multiple times until everything is closed. Then use the Action Chains menu to run the chain on a book and watch what happens.
I make my templates to be as non-destructive as possible, so it shouldn't change anything that doesn't need to be changed.
