If you want to keep the templates of ure current style when u create the style:
Let it use the template set you are using for your current (default style)...
BUT
make sure it "Creates a new replacement set"...
if you dont make sure the replacement set it set to new then you will lose all your current colors of the original style...
if you do that all your current hacks will remain and be on the new style u create as well...
hope that helps