Is it required to take from the entire head when shortening the hair for Hajj or 'Umrah?

Question:
The father says: The questioner asks, if a person took some of his hair during 'Umrah but did not cut all of it, is he still considered to be in the state of ihram? And what is the ruling on his action if he was ignorant of the ruling or knowledgeable about it?

Answer:
If the time has been recent, he should put back the clothes of ihram and complete the shortening from all of it, and there is nothing else required. As for if the time has been long, perhaps what he did suffices, because some scholars hold that shortening part of the head is sufficient. Yes.