How do I make several players use their money together?

SO I use the basic leaderboard provided by tycoon starter kits, next, I changed it to ZKills (instead of Cash) and fixed everything to make it work, so yes, it does work, but, I want all players to be able to use the kills they've accumulated as a team. How do I do that?

I have no idea how to do it and I can't find it on roblox wiki. If it helps, here is the leaderboard script.

function onPlayerEntered(newPlayer) 
    wait(.5) 
    local stats = Instance.new("IntValue") 
    stats.Name = "leaderstats"
    local cash = Instance.new("IntValue")

    cash.Name = "ZKills" 
    cash.Value = 0      -- starting cash 

    cash.Parent = stats 
    stats.Parent = newPlayer 
end 

game.Players.ChildAdded:connect(onPlayerEntered) 

What I mean by everybody sharing money is, for example: When you are in a game and it has the leaderboard and everybodies stats combined show at the top of the leaderboard where the stat is named. I want to use that number, the combined number of everybodies stats.