Email Templates adding Dynamic Fields

Hi,

      In Email Templates if we create global template and in that we need to map fields dynamically.

      For Example : We have a custom entity named as "Customers" and in that we have a lookup named "Country". In "Country" lookup we             have a field named a "State".

      My requirement is : Can we get data from that "State" field in "Country" lookup and map into Email Templates dynamically.