Yes, the agent may appoint a substitute, provided the principal does not prohibit him from establishing a substitute. However, please note that the attorney-in-fact shall be responsible for the acts of the substitute when: *He was not given the power to appoint a substitute; *He was given such power (the principal did not designate a particular substitute) but chose a notoriously incompetent or insolvent person. Please note further that if the attorney-in-fact appointed a substitute even with the prohibition of the principal, all acts of the substitute shall be void5. For a substitution to be possible, the attorney-in-fact may execute a separate Special Power of Attorney (SPA) appointing a substitute, referencing/mentioning in the document the original SPA that the principal has given to him to show that he has the authority to act on behalf of the principal; and, enumerating in the SPA the specific tasks that the substitute shall perform.