Any way to merge entries?

I stored infos on a site in a secure note. Later, I was given an account to this site and stored the username and login in a login entry. I then had to copy item after item all infos from the secure note to the login entry. I came to my mind that a merge like in address books would be useful. Another reason is that some web sites can be accessed from different URI what sometimes lead to several login entries that one would like to merge.