Creating a bespoke version of Harvard

I've seen that lots of universities have their own style of Harvard available in the list of styles within Zotero. Is it easy enough to add a new one to that list, ie for my university? If so, how does one go about creating a style? In particular, I'd like to modify a more standard Harvard version (perhaps the Cite Them Right version of Harvard), and just make a few ammendments to it. Not really sure where to start though.
Any suggestions, very welcome.
Thanks very much
Greg
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