Custom entities

So is it possible for me to make a custom entity in hammer. I want to make something like a custom vehicle, can I make it with an add-on

(User was banned for this post ("Didn't read the rules sticky" - OvB))

Questions go iiiight 'ere ->

Thanks, I’m not new to it just wanted to know that

[editline]11th August 2017[/editline]

Hol up, I just checked it and idk which one it is so :confused: u betta have some damn explaining to do

Read the sticky my man, we’re just giving friendly advice. We’ve had a big influx in 2 second questions like this when we have a perfectly good megathread to ask 2 second questions in

Why u calling me man ?? Also I’ll made sure to I just needed specifications

[editline]11th August 2017[/editline]

Sorry I’m probably gonna get banned lol

Not even unlikely. This is from the new post in the rules thread:
Basic question posts, and single question threads posted outside of this megathread will get you banned, and your thread locked without an answer!

You can use custom entities in hammer. Just make sure you make your own/edit a .fgd file to support the new entity if you want easy editing. Otherwise you can type everything in manually by disabling smartedit and adding your own keyvalues.