Using SD3
How do I copy a class with parameter's to another class and then rename the new class so I can change some of the parameter's and have the new class showing up in the selectable list?

After you add the class to your second element, you could assign the second element a id and then you would have to add the additional changes to the id, not the class.

If I understand your question correctly, you want two elements that have the same style but different class names. There are two ways to do this.

Method 1
Create element and add class (myclass) with all its stylings.
Create second element and add the same class (myclass).
Now both elements have the same style.

Click the x of the class name of the second element and delete it. BEFORE YOU CLICK ANYWHERE ELSE, add a new class name (myclass2). The result should be that the 2nd element has a different class name but the same styles as the first element.

Method 2
Create element and add class (myclass) with all its stylings.
Create second element and add the same class (myclass).
Now both elements have the same style.
Add a 2nd class name to the second element (otherclass).
Click on the first class name (myclass) so that it is grayed out. Now any styles you change will apply only to the 2nd class (otherclass) so that the 2nd element keeps all the styles of "myclass" and adds the styles of "otherclass."

Tnx
I will test this and make good use of it

I'm using Method 1
and it's working perfectly

Thank's to Method 1, all of my classes and elements have meaningful names. No longer container-1, paragraph-3 and so on.