Rload Nav Panel (Left side Menu) Only

How do I reload the left panel (Nav Panel) Onload (Not Reload web browser), I want the numbers in the Nav panel to change if there is an update or data change. If you update the changes in Main Viewes, I can already. but for an update in the Nav panel (left panel) I don’t know how. Please enlighten me.
This my screen shot
LeftPanel
Regards