How to create external ltm monitor through tmsh

I am trying to create an external ltm monitor through tmsh but I receive the following error when using this command:

tmsh create ltm monitor external somemonitorname - Gives me error "Monitor /Common/somemonitorname parent not found"

list ltm monitor external - doesnt give any results

If we assume that I have a custom monitor made from the template here /config/monitors/sample_monitor . How do I import it and make it to work through tmsh?