Aircraft Problems?

I dont understand what it measn in the docs page. here

If your VA does not want to use registration numbers, you can enter one generic registration value. The system will not check if a registration is already in use on schedule for this reason.

How can i do it?

For all the aircraft you add, use one registration number - ie “N12345”. Then in your schedule’s, just use that aircraft for the registration

For all the aircraft you add, use one registration number - ie “N12345”. Then in your schedule’s, just use that aircraft for the registration

I still dont understand? Sorry like what?