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. Learn more about Mailchimp tags. 

In Salesforce, we store the tags on their Mailchimp Member record, in a field called Tags. We also store a tag count, for reporting purposes. Tags on members are synced during the Primary Sync, usually hourly, or you can run it manually on the Mailchimp Settings tab or a specific audience.

Managing tags:

• Individually, by hand: 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. 
• In bulk: Guides: You can add and replace tags via the Data Wizard.
• Individually with automation (flows, code): Our tag management and subscriber invocable actions can add or remove tags or create dynamic tags on the fly.

Changing tags' text: If you rename a tag in Mailchimp, you have to run a full refresh in Salesforce to update any members already assigned the previous value. 

This can be done on a single audience via the Full Refresh button on the Audience>Members list for all connected accounts in Mailchimp Settings.

Note: An audience's collection of tags are not stored as records in Salesforce. Instead we have a quicklink on every Audience to access those.  https://jmp.sh/jtk4f0S2