[11.x] moving existing terms to a different taxonomy while keeping existing usage

Taxonomy is a great thing. However I found out that it is rather static implemented in drupal. I started with a main list and taxonomy terms under each topics but after some time I found out I would like to reschedule the terms under another topics. So what I want is

• Dairy
  • Milk
• Drink
  • Alchohol
    • Beer
    • Wine

now I found out that I would like to have a complete topic about wine, since I want to use that for another type of service (forum, gallery, etc) and to expand it further to wine from 1991, 1992, etc.. or I want to move milk

I quess the only way to migrate the content with taxonomy associated to is, is by diving into the database and use some magic sql statements?

It would be nice if drupal had an interface where I can select terms and topics on the left and move them to a new term/topics on the right

I hope this makes sense, otherwise, feel free to ask what I want.