How to copy an entire page class and paste a sub-class or style onto it?

Anyone know of a way to use a text class id, which has been used through the site, and copy another style onto the prefix and have it cascade down to the remaining viewports?
What I am trying to do is be able to select all class id’s of a header or text on one entire page and paste another class or style onto it. For example:

PC: class id=“h1 header”
TAB: class id=“h1 header” - copy all classes with id=“h1 header” and paste a sub class of “tablet size” which would equal a combination class with an id of “h1 header, tablet size”
MOBILE LS: class id=“h1 header, tablet size” - copy all classes with id=“h1 header, tablet size” and paste a sub class of “mobile landscape size” on to it which would equal another combination class id of “h1 header, tablet size, mobile landscape size”
MOBILE PT: class id=“h1 header, tablet size, mobile landscape size” - copy all classes with id=“h1 header, tablet size, mobile landscape size” and paste a sub class of “mobile portrait size” on to it which would equal another combination class id of “h1 header, tablet size, mobile landscape size, mobile portrait size”


Here is my public share link: LINK
(how to access public share link)

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