Nick here from Shopify.
Right now it looks like I can dedicate one email list to use. Are there any workarounds, or something I'm missing?
Within MailChimp, there is definitely a way to create specific campaigns for certain segments of your contact list based on a number of different parameters. You can do this in MailChimp by going to Lists > New segment and then create the segment on the conditions you want.
MailChimp has a great guide going through all the steps and details for creating and sending to segments which I think will really help you. You can see the guide here.
Hopefully, this helps and is what you're looking for. If it isn't, be sure to let me know in a reply.
All the best, Nick
No problem at all. Ah ok, I understand what you mean now. MailChimp actually has a few guides going into detail about how it works with Shopify which you might find useful.
There is one built specifically for segmenting Shopify customers which you can read here.
Hopefully, this is what you are looking for.