I sometimes create specific custom menu links for one client in one sub-account. It would be ideal if we could create folders (like custom fields / values / funnels do) so we can organise custom menu links rather than having one long list. That way, if I have a client with several custom menu links specific to their sub-account, I can open that folder and work within that folder, focussed on supporting one client.

The current long list format does not easily allow for this.