This is the WSNavMenu/Multilevel template. It should be called in the following format:

{{WSNavMenu/Multilevel
|Input=@ <menu item>
@@ <menu sub-item page> * <displayed text>
@@ <menu sub-item>
@@@ <menu subsub-item page> * <displayed text>
@@@ <menu subsub-item page> * <displayed text>
@@@ <menu subsub-item>
@@@@ <menu subsubsub-item page> * <displayed text>
}}

Example (note: spaces before the @@ are optional, not required):

{{WSNavMenu/Multilevel
|Input=@ Organisatie
 @@ HR
 @@ Platform
  @@@ Datacenter
   @@@@ Datacenter/Overzicht*Overzicht
   @@@@ Datacenter/Procedures & Werkinstructies*Procedures & Werkinstructies
   @@@@ Datacenter/Algemene pagina's*Algemene pagina's
   @@@@ Datacenter/Technische pagina's*Technische pagina's
}}