text: According to the documents of Vatican Two,  'The Priest' of the Diocese is the Bishop. Since he can't be everywhere to minister his functions of leading Liturgy, distributing Sacraments, Preaching and Teaching, and of Administration, the Bishop delegates some of these tasks to others.
  
  Theoretically, I suppose he 'could' delegate them to anyone he deemed capable. By custom and subsequent 'Canon Law' most of the tasks were reserved to those who became 'Clerics' – and the requirements for that were laid out in the customs. So also the training required and all the other requirements for such 'offices'.
  
  Increasingly many Bishops are delegating some of their 'powers' to 'lay' people. Both men and women have been designated to lead services, administer a parish, teach, and many functions formerly reserved to 'the priest'. 
  
  It may be through an 'ordination'. Though usually that is considered a 'Sacrament of Orders' required only for 'priests' or 'Deacons'. Most new roles don't require that