Converting D&D 2014 Character to 2024 Character in Builder

In my campaign I have a player who is a War Priest created with the 2014 D&D Beyond Character Builder. Now that he is 9th level, he wants to take advantage of the 2024 War Domain spell Steel Wind Strike. In the character builder however, the Steel Wind Strike spell is not available as a prepared spell. Is there any way to convert a 2014 character to the 2024 rules so, in this case, the Steel Wind Strike spell would be available?

Thank you, 
The Dragonmaster

So, in essence, I would have to rebuild the character from 1st level using the 2024 version of the Cleric? Because I looked at trying to change the current 2014-character class to the 2024 version in the Character Builder and there is no way to do that.

Cool. After I change the level, will I have to rebuild all the other successive pages of information, such as re-add all the equipment, magic items, ability scores, background, etc. or will it retain what is already there?

You can just add the 2024 cleric class and levels then drop the old one. No need to make a copy. They will need to pick their class features again though.