How does the integration store Mailchimp Tags?

Tags are special labels that categorize your audience members in Mailchimp. They can be used to segment members for mailing.

Our integration stores the tags assigned to each member on a field in their Mailchimp Member record in Salesforce. We also store a tag count, for reporting purposes. Tags are synced with the Primary Sync, usually hourly, or you can run it manually on the Mailchimp Settings tab.

The Member detail component, available in an Audience or on the contact or lead, allows you to manage a member's tag. You can assign or remove existing tags and create new tags for that audience on the fly. New tags added this way will be synced to the Mailchimp audience for use later. Learn more about Mailchimp tags. 

Please note that we don't store the audience's tags as their own record in Salesforce. Instead we have a quicklink on every Audience to access those.  https://jmp.sh/jtk4f0S2  

Guides: Managing tags with Data Wizard and invocable actions