you could create as many dashboards as you want and can publish them to various user groups, roles or single users.
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In addition to what Markus mentioned, you can find plenty of information on dashboards on our online documentation page here https://help.landesk.com/docs/help/en_US/LDSD/7.8/Default.htm , you can select the index tab and use the search function.
You might also found this useful, Insert a personal default dashboard for a specific user in WebAccess using a script.
If the link on the Raise Request takes you to your Service Catalog, then why not publish only the required requests to the required groups of people, or by a role