Thank you for your question. Yes, as long as you have registered the domain, you can add it as an Addon or Parked Domain.
It will then have its own folder for storing the website files.
If you have any further questions, feel free to post them below, or contact live Tech Support.
They are available 24/7 via:
Phone: 877-595-4482 x2
Chat (there is a link on the top right).
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