How the hell do you transfer 1 directory to another?

How the hell do you transfer 1 directory to another? I have tried doing it sub directory by subdirectory with fix redirectors and save all after every sub directory is transfer… this method is hit or miss… i just ■■■■■■ up a huge level because no most of my meshes have now material applied to them…

Why is this so stupid and how do i fix it?

[redacted]… i wish i backed up my project before attempting to move a directory…