How to do inheritance without adding node to scene tree?

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How to do inheritance without adding node to scene tree?

godotMonoNoob

I have a Ghost base Scene with a Ghost script that I want to have a SetSpawn function in. This function needs to get a reference to my Tilemap node which is in its own Maze scene so it can only spawn a Ghost on a "path" tile. To do this, by my knowledge I need to GetNode in the Ready function. This Ghost Scene/Script is a base class with which my Red Ghost Scene/Script are inheriting from. However, I want the Red Ghost scene to be instanced in the scene tree and not the base Ghost scene. How can I make my SetSpawn function in the Ghost scene without having to add the Ghost scene to the scene tree? Or should I just add it to the scene tree anyway?

Sorry if it sounds a bit confusing

LeslieS

Inside the base Ghost scene:
var tile_map:Node2d #(or whatever type it is...and you can set it up with set/get if you like)

Where you need the red ghost scene:
var red_ghost_scene = preload("path to red ghost scene")

When you need to instance the scene:

var red_ghost = red_ghost_scene.instance()  
red_ghost.tile_map = $TileMapNode
$WhateverNodeYouWantTheRedGhostToBeAChildOf.add_child(red_ghost)