How to merge two lists into one list

[onebox220722]

Hi all,
I have one verified list and beside it another one that refers to the same place how can I merge this list to the already existing one,
Notice that: the other location is not under my control and it has many reviews so I want to merge it to my verified list
is there any tool that helps me to do this task?
Regards

 

[Colan Nielsen]

Can you clarify what you mean by "list"?