It would be best if you watch the video in the first post, it's easier to see and understand than to explain. Basically you have to create a shared folder which is the one where your lol is installed on your main pc (no vm) and then you can access this folder with every single VM Ware clone.
Here's my config, but I'm not too sure if it will help you.
[CONFIG]
; Path to your League of Legends launcher, without the lol.launcher stuff!
path = Z:\Games
; Path to your accounts file
accounts_path = Z:\Games\1
;Select region: EUN, EUW, RU, NA, OCE, BR, TR, KR, LAN or LAS
region = EUW
;MaxLvl in acc.
maxlvl = 10
;Set boost to 1 if you want it to buy 3 days xp boost when you get free 400 RP
boost = 1
[GAME]
;Custom name
GameName = ***
;Custom password
GamePassword = ****
;Custom size [6,8,10]
GamePlayers = 6
;Don't change it, thanks
GameID=0
Z:/ signifies the shared folder for the VM and this path is the same for every VM I use.