Duplicating a Customized Theme to New Domains

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Hello,

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I’ve spent a few days editing/tweaking a theme I’ve setup on a domain. What I’d like to do now is duplicate this exact setup I’ve made to 4 other domain names. I would then like to go about my business of tweaking customizations on these other 4 domains and would like them to have their typical WP functionality of building posts, pages, etc. but have inherited this edited core theme I spent time customizing.

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What’s the easiest/simplest way to move this primed theme I have customized to 4 other domains?

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