Base Component component from existing Variants

How to make a “_master” component from an existing button-variant component? Is that possible? Without having trouble with components in all the files I have created?

I ask because my button variants (very comprehensive) already existed b e vo r I learned that there are _base components…
So what can I do)

Also the new feature component properties. is it possible to apply this to existing button variants?
Can’t find any tutorials on this!