How to add a folder on top of subfolders?

[Anonymous]

I have a folder in my local computer called "Total". There is a subfolder "2018-10" under "Total" and there are a few subdirectories under "2018-10":

/Total/2018-10/Subfolder_A/  files

/Total/2018-10/Subfolder_B/  files

/Total/2018-10/Subfolder_C/  files

I need to add a folder "2018" on top of "2018-10" so the directories would be look like this:

/Total/2018/2018-10/Subfolder_A/  files

/Total/2018/2018-10/Subfolder_B/  files

/Total/2018/2018-10/Subfolder_C/  files

Can anybody give some advice? Thank you!