The most "Splunk way" to do this would be to add navigation elements into the menu at the top of the page. This bar is what I'm talking about modifying:
You can modify what's displayed there by editing the Navigation Menu XML at
Settings > User Interface > Navigation Menus > default (for appropriate app)
If your Navigation menu currently looks like the one I posted, then the XML will look like this:
<nav search_view="search" color="#65A637">
<view name="search" default='true' />
<view name="data_models" />
<view name="reports" />
<view name="alerts" />
<view name="dashboards" />
</nav>
If you have two dashboards named primary_dashboard and secondary_dashboard, you could either add them individually to the navigation menu bar by editing the XML to look like this:
<nav search_view="search" color="#65A637">
<view name="search" default='true' />
<view name="data_models" />
<view name="reports" />
<view name="alerts" />
<view name="dashboards" />
<view name="primary_dashboard" />
<view name="secondary_dashboard" />
</nav>
Alternately, if you wanted them to be grouped together and have a little drop-down menu from which the user can select either dashboard, you use the <collection> element. So maybe you'd want them both grouped under the heading Most Useful Dashboards, then your code would look like this:
<nav search_view="search" color="#65A637">
<view name="search" default='true' />
<view name="data_models" />
<view name="reports" />
<view name="alerts" />
<view name="dashboards" />
<collection label="Most Useful Dashboards">
<view name="primary_dashboard" />
<view name="secondary_dashboard" />
</collection>
</nav>
