How do I get an object inside a model by only knowing the first part of its name?

I have a map system in my game where a map is loaded into a model called "Map" inside workspace. My maps are named Map1, Map2, Map3, etc. I need to get the actual map inside the map object so that I can clone something that's inside of that. How can I write code that works for all of my maps, no matter what the name is? Thanks in advance.

This seemed fun so I thought I'd answer it.

1. I recommend you use the server storage for each of your maps.
2. I recommend you use a folder called Maps
3. I recommend your maps be grouped into a model.
4. I recommend you clone the map and set its parent to the workspace to spawn it. It will spawn directly where you built it.

This script will be made with the above in mind.

local storage = game:GetService("ReplicatedStorage")

function SpawnMap(MapNum)
	for _, Maps in pairs(storage:GetChildren()) do
			local MapToSpawn = "Map" .. MapNum	
		if Maps.Name ==  MapToSpawn then
			Maps:Clone().Parent = workspace
			local MapObjects = Maps:GetChildren()
			for _, MapObject in pairs(MapObjects) do
				if MapObject.Name == "PlayerStartDoor" then
					local PlayerStartDoor = MapObject
					PlayerStartDoor.Lock = true -- Door is now locked
				end
			end
		end
	end
end

This scripts spawn a map of your choosing.

SpawnMap(1)

This will spawn Map1

when Map1 spawns the script will look for the door and lock it.

Loops are fun.