Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.
You can’t merge multiple Apple ID accounts.
See this Apple article: Delete apps on your iPhone, iPad, and iPod touch
Delete apps on your iPhone, iPad, and iPod touch - Apple Support
-> If you are using Screen Time, go to Settings -> Screen Time -> Content & Privacy Restrictions -> iTunes & App Store Purchases -> Change Deleting Apps to Allow.