The Catechism says
“As in the case of Baptism and Confirmation this share in Christ’s office is granted once for all. The sacrament of Holy Orders, like the other two, confers an indelible spiritual character and cannot be repeated or conferred temporarily.” (CCC 1582)
How is this to be understood?
When a deacon is ordained a priest or when a priest is ordained a bishop, isn’t the sacrament of Holy Orders repeated?