You may choose to address security of who can view what dashboards within a SAS Information Delivery Portal page by managing the 'Sharing' capabilities at the Page or Portlet levels, however the most gradular level might also require a 'lock down' to avoid users surfing for and locating dashboards they shouldn't see.

In order to accomplish this, utilize the 'Folders' tab in SAS Management Console and navigate to:

System->Applications->SAS BI Dashboard -> SAS BI Dashboard 4.2

IMPORTANT NOTE: You will need to modify each element individually as the current version of BI Dashboard (9.2M2 - 4.2) doesn't support moving the elements into an organized folder structure.