[Reports builder] operator * in a prompt list

Hi all, when i create a reports deploy on the Report server, i usually choose a filter prompted on Run. The lsit containt for example the list of my customers, but the list in empty like i want (like that, user can put a list from excel by copy-paste). But ... , if the want all the customers, what is the " * " operator to select all my records ?

Thanks for help

Erwan, France

Do you mean

In a drop down for a report parameter you want <all> to appear?