SubMenu witch 3Level

Hello everybody
On my site I can not have a 3-level menu for example

L1 the compagny
L2 Contact us
L2 The Team
L3 Administrative team
L3 sales team

Hello there,

I hope you are doing well today.

The third level menu system is not a feature of the theme because it can be unstable with WordPress updates however someone has created a work around for the Sparkling theme which could be used here.

Have a look:

Best Regards,