How do I point my Subdomain to correct root folder

I have my production site set up and now I'm trying to setup a dev/staging site to run live tests in.

I'm having issues pointing my subdomain to the correct root path on my Laravel app.

I need the following:

• dev.example.com to point to root /var/www/dev/public;
• example.com and www.example.com to point to root /var/www/laravel/public;
• currently everything is going to /var/www/laravel/public

Server:

• Ubuntu 18.10 x64
• Nginx

I have a domain example.com and I made a subdomain called dev.example.com each reference to the domain is in my SSL Cert via certbot/LetsEncrypt. www.example.com, example.com and dev.example.com

DNS for Subdomain:

A (Record) | dev (Name) | 140.xx.xx.xx (Data)

I have 2 folders located here:

• /var/www/laravel/public (My Main Production site)
• /var/www/dev/public (My Development Site)

In sites-available /etc/nginx/sites-available I have the default file with the following configurations.

(I've tried multiple variation of this, but this is where I left off)

 server {

    root /var/www/laravel/public;

    index index.php index.html index.htm index.nginx-debian.html;

    server_name example.com www.example.com dev.example.com;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
        client_max_body_size 200M;
    }

    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
    }

    location ~ /\.ht {
        deny all;
    }

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}

# Virtual Host configuration for example.com

server {

    if ($host = dev.example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    listen 80;
    listen [::]:80;
    server_name dev.example.com;
    root /var/www/dev/public;
    return 404; # managed by Certbot

}

server {

    if ($host = www.example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    listen 80;
    listen [::]:80;
    server_name www.example.com;
    return 404; # managed by Certbot

}

server {

    if ($host = example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    listen 80 default_server;
    listen [::]:80;
    server_name example.com;
    return 404; # managed by Certbot

}

Again...

• I need dev.example.com to point to root /var/www/dev/public;

• I need example.com and www.example.com to point to root /var/www/laravel/public;

Any help in figuring this out would be appreciated.