htaccess and forum

[lee_sufc]

My current htaccess file looks like this:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^mysite\.net [NC]
RewriteRule (.*) [mysite.net...] [R=301,L]

...been using this the past year to redirect non www etc.

I now want to use mod rewrite to create static URLs for my forum. I've got instruction of what I need to add to my htacess file to do this but wanted to check I can add more details to my htaccess file without messing anything up or can you only have one instruction in the file?