wish to change appleid on new iphone whilst keeping original id on old phone
Unless you wish to spend the next year swapping back &amp; forth between IDs every time there's an update to something, best practise would be to treat it as though you were selling it &amp; wipe it completely, then set it up afresh with a new ID.

See What to do before selling or giving away your iPhone, iPad, or iPod touch

To get back any apps [though not their data] that were previously used on that phone, investigate Family Sharing which will allow any apps or music purchases to be shared between all 'family' members.