Regular (normal) unit -> into a Hero?

Isn't there just some simple boolean under the object editor to make a unit into a hero? I kinda expected this, but maybe I have to start out with a Hero and then work all the info /back/ to the unit...

which is correct, or has anyone found another possibility?

While it would theoretically be possible to convert units into heroes by editing the files by hand, the only practical way is to start with an hero and convert it into the unit you want.