it would be cool if it was possible to copy the properties of one object to another object.
But why? You could also Create a class of button with all the basic stuff and then create another class that override some elements style or add new one.
ok! if i create style with lots of parametres, and i want create new, as the one, but with another background color?
in my proposal, I suggest a quick and useful function, do you agree?
This not for only button 
Then you can simply add another class to the object and change only it’s color. You can check it on my both site and troubleshooting link.
Question #1
Site :: http://forumhelp.webflow.com
Playground :: link
Here is the similar topic with my response 