If you already have a configured monitor and want to use it in another project of yours, you can clone the entire server to a project you want:
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Switch to the Monitoring page of the project with the configured monitor.
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Right-click the server holding needed monitors and select Clone Server, or select the server and click
on the toolbar. 
Click the image to enlarge it.
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In the Clone Server dialog, select load tests or projects to which the server should be cloned and click OK. See the sample image below:
Click the image to enlarge it.
ReadyAPI will clone the monitor to all selected load tests.