Hello Andy Smith,
The SiteMenu has a property called StartingNodeUrl which you can use to select the starting node from where the RadMenu binding will start. You can add the code below to the SitePanelBar or your custom control to expose the same functionality for the RadPanel bar control
Another option is creating a custom controls and bind them to the pages you want.
You may find this post useful -
SiteMenu Builder
Best wishes,
Ivan Dimitrov
the Telerik team
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