Copying css data from one file to another

I have a style sheet a file A.css
.class1 {
         font-weight: bold;
         color: #cc3333;
         text-decoration: underline;
}

I want to copy class1 style sheet information to another
like class2 = class1

.class1,.class2 {
         font-weight: bold;
         color: #cc3333;
         text-decoration: underline;
}
Do not know if this is what you want

Yeah the same thing.
Design and attributes of two classes same but name different.

thanks for providing it