There are a few ways to share data in DashBoard.
One mechanism would be to use the jsonport="..." attribute at the top of a custom panel.
What this does:
It exposes the parameters in this custom panel as a virtual device (it turns the custom panel into a server).
In another DashBoard, you can then add a manual connection to your computer's IP at the port you specified in the jsonport attribute.
Changing the parameters in one DashBoard will cause the parameters to change on the other.
What you can then do:
You can then create a new custom panel and point to your virtual device as the panel's data source (make it a client). You can put any parameters from your server custom panel into your client panel.
#DashBoard