Transfer Xbox purchase and Fortnite history to child account

My child has been using an adult account to play Xbox, make purchases (approved by parents), etc. I'd like to transfer all purchase history, Fortnite account, etc. to my son's Microsoft account. How do I do this?

You cant unfortunately. Nothing is transferable between accounts.

Hello again, the first thing to check is that the V-Bucks have been redeemed into the same account your child uses to play Fortnite.

Click the link below and sign in with the account he uses to play Fortnite on Xbox and see if the V-Bucks show up in his Purchase History list.

Purchase History

https://account.microsoft.com/billing/orders

Hello again, first you need to make sure you redeem the game code on the same account your child uses to play the game.

To do this click on the link below and log in with the account your child uses to play and look in their Purchase History.

Purchase History

https://account.microsoft.com/billing/orders

If the item was redeemed correctly on the account, he needs to turn on the console and log in to Fortnite so that the game can take over the bundle on the account.

Did you buy the V-bucks on PC version of Fortnite or Xbox?

If you we logged into Fortnite on PC, you have to wait a few seconds before the V-Bucks show up. The V-bucks transfer from PC to Xbox after you bought them and they were accredited to your Epic account. If they don't show up you need to contact Epic games
to review your purchase history. If you bought it on Xbox you can do that at account.microsoft.com > payment and billing > purchase history

Content cannot not be transferred but 8t can be shared by setting your Xbox as the home console.

The friends list you will have to re-add to the account you would like to use.

As for the fortnite sign in if you set the console as home when the child account signs in it should sign in as the child account.