I bought 4 different custom URLs to test and find which domain the market likes best.
When I am running Google PPC or Bing PPC traffic, do I have to direct link to each actual URL? or can I simply redirect to my current main store.
If I have to direct link each URL with my shopify store, how do I set this up?
If you want to base the split-test just off of the AdWords performance, keep everything about the ad the same, but change the destination URL and display URL to the various domains. So if you have 4 domains to test, you'd run 4 ads. The landing page will have to be on the same domain (you cannot just redirect traffic to a single domain) because it violates AdWords' policy.