.htaccess where ? in Root or Directory

I have installed my WP blog in directory xxxxx.com/vince/, in this directory I have a .htaccess file like below.

Is this (xxxxx.com/vince/) the right place to put this .htaccess file or do I need to put in the root?

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /vince/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /vince/index.php [L]
</IfModule>
# END WordPress

Also if I want to combine CSS and Java (with already have combine.php).

RewriteRule ^css/(.*\.css) /combine.php?type=css&files=$1
RewriteRule ^javascript/(.*\.js) /combine.php?type=javascript&files=$1

Can I just wright the above in the same .htaccess between # BEGIN WordPress and # END WordPress or below the # END WordPress or do I have to do this in the root .htaccess??