Membership Plugin with Mega Menu / Uber Menu

I have installed the Membership Plugin on this site and we are currently developing content that will only appear to members.. This is working great but... We have the Mega Menu plugin installed and I have not found a way to set menu items to be visible only to members
Has anyone done this or can advise if there is a solution. Ideally I would like to be able to set sub-menu items to be visible only to logged in members.