Can I reuse the same Mailchimp tags each time I add contacts from BytePhase?

Yes. When you push contacts to Mailchimp you can type new tags or pick ones you used before. Tags you create are saved in BytePhase, so the same labels, such as a device type or a service you offered, are ready to choose next time. The tags are applied to the contacts in your Mailchimp audience, where you can use them to segment campaigns.