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Sub levels in overworld?

Is it possible to create an asm patch to enter in sub levels (25-100 and 13C-1FF) in overworld?
For example:
If Mario is in a certain position on the main map and has a layer 1 tile configured to bring it to level 116, the patch will take Mario to level 1ED.
It's difficult.
Sure, you can make a level tile link to a different level. That isn't the problem, though.
The bigger problem is that SMW has been build to only support 96 different levels (to say that this isn't just Lunar Magic's limitation). Any more and you need some workaround to bypass this limit which may or may not be hacky (even increasing the level stats isn't enough as you need to deal with the events and other stuff).

This is what makes e.g. the VLDC compilations and especially JUMP quite difficult to create as their creators has to deal with this problem. VLDC is easier as the creators of the compilations won't have to deal with events and only save dragon coins and exits. JUMP, which is more of a regular hack than VLDC, on the other hand, does use events handled by the extended levels.
At least one patch that adds more translevels (as well as more events) exists. JUMPhalf has one, and the way it works is it adds 1E0 to the level id set if you use a level tile from the second layer 1 page (making levels 1E0 to 1FF available for use in the overworld). Also some more complicated shenanigans for more events. It isn't released to the public because chances are you won't need it. If you're planning to have more than 96 levels in your hack, I recommend you to trim that down or you'll easily be worn out before getting even close to that amount of finished levels.
It's easily the best thing I've done
So why the empty numb?
But how can I start the patch? I do not have much knowledge of the ASM.
Haven't you read our posts? It's better to not bother with more levels on the overworld else you get it more problems than you'd actually need.