using Virtual Column as a Ref

my gsheet has 2 sheets.  Main sheet (which i cannot edit) and then a sheet with the names of Hosts.

I would like to create a virtual column in the Main Sheet that I can pull in names from the Hosts sheet.  So far i've created the virtual column and set it as a Ref but not sure what the App forumla needs to be for it.  

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Which columns would you use to match the records up? Virtual columns cannot be edited by the user, if that's what you're thinking, they are calculated/generated only.

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