Do you currently own the domain? :
If you do, then you can create the subdomain: wanderlust.epicure.com.
Please view the support guide above that @bobdavcav provided you.
If you don't own the domain: epicure.com then I'm sorry you wouldn't be able to create: wanderlust.epicure.com.
However, the last I checked the domain: wanderlustepicure.com was available. You can register this domain by going to Store > My Domains in your Dashboard.
If you need more information on this, please view the guide below:
Feel free to reach out if you have any questions!