You will need notepad++ (or use wordpad) or better editor
Also game may crash after some uses of it elevator

First of all it wont work on floor 2 only on 1 floor but there is a way out to make it work atleast some
Big Elevator has 2 frame one for doors and one for floor
sprite 2095, object 1221
frame 1 is doors
frame 2 is floor
You need to put both of these on 2 floors in one place otherwise it won't work
by one place I mean that on both floors they have the same position
On floor 2 put teleport to next floor and put it in big elevator on first floor
On floor 2 you will be getting to floor 1 but doors will be closing
And on floor 1 you just walk in and teleporing like normal elevator
Video showcase - https://youtu.be/7uBF57t89S4
and it should work

So it almost the same
But you will add it with better editor
Go to search and type bigelevator use first one like on photo
put doors and floor on the same postion as again on both floors
and add floor teleport on 2 floor to 1 floor as it been said in section with notepad++
You read a bit notepad++ section to understand but can add in this way

Notepad++ - https://notepad-plus-plus.org/downloads/
Better HLM Editor - https://github.com/Vlad-Tarabukin/better-hlm-editor
Русский - https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=3481278381

So yeah it works like that and crash after some uses but maybe you will find a use.