It sounds like you have multiple, completely separate online store.
If each store has its own website, brand, and checkout, the best practice is to connect one Klaviyo account per store. This keeps each customer base, order history, and site behavior separate so your flows, segments, and analytics stay accurate.
You can still use the same Klaviyo user (email/password) login to switch between accounts.
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Kim — Founder @ Cadence | Helping brands automate recurring campaigns (daily, weekly, monthly) | Happy to connect! | https://cadencecampaigns.com