Preventing thresholds from being overwritten

Preventing thresholds from being overwritten

Hi
 
I have a device template in which I have defined a threshold for the Free Disk Space in MB monitor.
 
This threshold is appropriate for most drives, however for some drives it needs to be changed. From what I can tell I need to change it for each drive monitor individually which is not exactly ideal, but it works.
 
Now lets say I add a new monitor to my device template and want to apply it to all devices using that template. I then apply the template to my devices and get the new monitor, but now the thresholds that I mave manually changed are overwritten with the values in the template. I would expect Apply & Overwrite to behave this way but no Apply.
 
Is there any way to avoid this or a better way to accomplish the same result?

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