Saving Tone 'Custom' Curve in Lightroom 4 ???

I've been "Playing" in Lightroom 4 recently and in so doing I began to create a few different results by radically adjusting the tone curve(s) of a file.
My question is this, I've found a few that produce some pretty cool results, is it possible to "Save" a Custom Tone Curve for use in future files ???
I've looked into two of my Lightroom 4 "Manuals" but I haven't been able to locate a way to "Name" a preset for the tone curves.

HELP !!!!

Thanks,
Roger