Marcelo,
In my example they do, but that can be edited in the grid. You will need a date to create the work order but it won't have to be the exact date. This is needed because it is a required field in the table. You cannot create the work order without it. Using the project, you can set the occurrences to a status of 'Waiting on Someone Else', this will put the Work Orders in the Waiting List. Then, as they are completed, you can update the next work order in the series with the date scheduled.
After this is created, you can use the "Copy Select" button to copy that exact project for other customers.
It will take you to this screen, where you select the customer to copy the work order to.
Hope this helps.
- Adam