New Post: Best way to Redirect from .com/ca to .ca

I currently have a Canadian site, here

treehousevitamins.com/ca (Canada - Englis)
treehousevitamins.com/fr (French)

We are bringing on a US site and want to change things around:

treehousevitamins.com (NEW US English)
treehousevitamins.com/ca --> treehousevitamins.ca (Canada English)
treehousevitamins.com/fr --> treehousevitamins.ca/fr (Canada French)

Is there a way within Composite to 301 redirect anything from "treehousevitamins.com/ca to treehousevitamins.ca or is this a task that is better handled by IIS?