Welcome to the Atlassian community! Your question is quite broad, and I'd love to help you better. Could you please provide a bit more detail? For example:
If you want to manage customers who raise support requests, Jira Service Management, with its customer and organization features, would be the usual starting point, or the newer CSM, with a lot more customer-focused features. But with more context, we can point you in a better direction.
Cheers, Martin
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