Adding a new column to a table using data from another table

I have an existing table that I want to add a new column to, using specifically matched data from another table. 

The table I want to add to is named 'Case'.  The table I want to pull from is called 'User'.  

I have an established relationship between 'User'[ID] and 'Case'[OwnerID] - visualizations work perfectly to resolve Case number to Case owner name for instance. 

What I'd like to do is populate a new column in the 'Case' table that displays the 'User'[Name] field for each line (case number).  I know I could build a conditional colum, but was hoping there was a better way to look up the value and populate