Master file

[LFMM150]

Hey, 

How do i create a master folder "A" then create linked subfolders "b, c, d" that will have all the contents of the master folder A? where I update the master A and the system automatically updates the subfolders b, c, d?  (it is for a site safety file) 

[#2]

That's not a common file system configuration. I don't know of any way for Teams to do it. There may be third party applications that can do it.
It's not hard to write a batch file that does it for you and then just rerun it periodically.

[#3]

SharePoint has Document Sets which might be what you are looking for https://support.microsoft.com/en-us/office/introduction-to-document-sets-3dbcd93e-0bed-46b7-b1ba-b31...