There's two places inside an edc file where you can define aliases, and the syntax is different for each one:

group {
   name: "group/name";
   alias: "another/group/name";

   parts {
      alias: "another.part.name" "part.name";
      part {
         name: "part.name";
      }
   }
}

It would simplify edc learning and writing if alias was allowed inside part, because then it could have the same syntax as the group alias:

parts {
   part {
      name: "part.name";
      alias: "another.part.name";
   }
}

The current alias in parts can be allowed too, to support old edc files.