Can I merge two folders on Box

I have an issue that I have 2 difference folders (sub folders are same name).

How can I merge these 2 folders into one.

For example:

Before                            
                            
    Folder A                Folder B        
        Sub 1                Sub 1    
            file 1                file 2
        Sub 2                Sub 2    
            file 3                file 4
               
After                            
    Folder A                        
        Sub 1                    
            file 1                
            file 2                
        Sub 2                    
            file 3                
            file 4

In the simplest way I just Get all the items inside folder A and Folder B. Put it to a Structure with child and parent for each A and B. Then Loop over the structure to get which files will be inserted to sub folder of folder A. Then call the copy API for each file. But When the number of file is so much, I think it will be slow to copy each file to the destination folder or even we reach the rate limit for a day.

Thank you for reading my problem.

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