Is there a way to make players go through npcs?

I want my players to be able to go through NPCs as if i simply turned off cancollide. i have tried using collision groups like this:

local phyicsService = game:GetService('PhysicsService')

local plr, npc = 'Player', 'NPC'

local setPlr = phyicsService:CreateCollisionGroup(plr)
local setNpc = phyicsService:CreateCollisionGroup(npc)

phyicsService:CollisionGroupSetCollidable(plr, npc, false)

function addToCollisionGroup(mod, group)
	for k, v in pairs(mod:GetChildren()) do
		if v:IsA('BasePart') then
			phyicsService:SetPartCollisionGroup(v, group)
		end
	end
end

addToCollisionGroup(workspace.NPC, npc)
addToCollisionGroup(workspace.NPC2, npc)
addToCollisionGroup(workspace.NPC3, npc)

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(char)
		addToCollisionGroup(char, plr)
	end)
end)

I have tried many tings like that, but this is the closest ive gotten. it didnt work. any thoughts?

You can use i,v in pairs() to do it. You can use GetDescendants to find which is a part or not, and then add a simple if statement

for i,v in pairs(game.Workspace.Npc:GetDescendants()) do -- basic for i,v in pairs

Now we need to determine which is a part or not, so like I said we can use an if statement

for i,v in pairs(game.Workspace.Npc:GetDescendants()) do
if v:IsA("Part") then -- find the parts of the npc

Now that we have all the parts in the npc, we can make it to where CanCollide = false

for i,v in pairs(game.Workspace.Npc:GetDescendants()) do
if v:IsA("Part") then -- find the parts of the npc
v.CanCollide = false
end
end