You can add a new person with the name "der Wissenschaften in Wien. Commission zur Leitung der Herausgabe der Acta conciliorum saeculi XV., Kaiserl. Akademie", or you can "der Wissenschaften in Wien. Commission zur Leitung der Herausgabe der Acta conciliorum saeculi XV., Kaiserl. Akademie" with a person entry that is so far only been referred to by another name (such as a former name or an alias name).