Merging between two apple IDs
I want to merge between my two apple IDs
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Merging Apple accounts (IDs) or transferring data is not officially supported, nor can it be done easily or completely.
Apr. 2018 post by ASC helper Winston Churchill on transferring data from one Apple ID to another. Can I merge two iCloud accounts - Apple Community
Feb. 2021 tips from Eric Root Apple ID - Apple Community
Look into using Family Sharing to continue to be able to use items purchased with one Apple ID with other Apple IDs, or to share photos.
Family Sharing - What is Family Sharing? - Apple Support
Set up Family Sharing - Set up Family Sharing - Apple Support
Also: Share folders with iCloud Drive --> Share files and folders in iCloud Drive on iCloud.com - Apple Support
Fortunately when you sign out of one ID and sign in with a different one it asks you in most cases if you wish to retain the data from it on your device. Say yes and then delete individual items you do not want.
Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac --> Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support
If another Apple ID is signed in you may need to enter the password for that ID to sign out of that ID first.
Click on this link to learn how to 'Sign in with your Apple ID' --> Sign in with your Apple ID - Apple Support