First, select a [ Data ] folder and click a [ Properties ] 

Move to [ Sharing ] -> Click a [ Advanced Sharing... ]

Uncheck a [ Share this folder ] 

Copy a [ Data ] folder . and paste to [ New Main PC ] 

After that, set a [ Sharing ] option.

If you dont know how to set a [ sharing ] , 

Please refer to [ How to share a [ Data ] folder ] on FAQ.