How can I set a certain cck value to selected nodes using View Bulk Operation (VBO)?
Create a view, and add Bulk Operation to the field.
In the configuration field: Bulk Operations: Content
  Bulk Operations -> Selected Operations,  you can choose the operations you would like to perform in bulk. 
  Once you done, save the view, and go to the view page.


Select the nodes you would like to edit
Choose an operation, click Execute
Select the field you like to edit
You got the rest.