Merge two .htaccess codes - apache

Question

I have two .htaccess , the fist .htaccess locate in the root directory which is www folder and the 2nd .htaccess locate in folder called forum
the .htaccess codes in www folder cannot work with the .htaccess codes in the forum folder
what i am working on is how to merge both htaccess to be in the root directory www
.htaccess in the www directory
Options +FollowSymlinks -MultiViews
RewriteEngine on
RewriteCond %{HTTP_HOST} ^site\.com$ [OR]
RewriteCond %{HTTP_HOST} ^www\.site\.com$
RewriteRule ^/?$ "http\:\/\/www\.site\.net\/" [R=301,L]
RewriteCond %{HTTP_HOST} ^(?:www\.)?site\.com$ [NC]
RewriteRule ^(.*)$ http://www.site.net/$1 [R=301,L]
.htaccess in the forum directory
#RewriteEngine On
RewriteRule ^site-t(.*).html showthread.php?t=$1 [L]
RewriteRule ^site-f(.*) forumdisplay.php?f=$1 [L]
RewriteRule ^f(.*)-(.*).html forumdisplay.php?f=$1 [L]
RewriteRule ^site-u(.*).html member.php?u=$1 [L]
RewriteRule ^index.php$ http://%{http_host}/ [R=301,L
RewriteRule ^t(.*).html showthread.php?t=$1 [L]
RewriteRule ^f(.*).html forumdisplay.php?f=$1 [L]
RewriteRule ^post(.*)-(.*) showpost.php?p=$1&postcount=$2 [L]
RewriteRule ^u(.*).html member.php?u=$1 [L]
RewriteRule archive/t-(.*) archive/index.php/t-$1 [L]
RewriteRule tags/(.*).html tags.php?tag=$1 [L]
RewriteEngine on
# This file is only needed if you have set the Forum Component URL in your admincp and you are
# using the mod_rewrite option for friendly urls. If this is the case, copy this file
# to your forum component stub directory.
# If you are having problems or are using VirtualDocumentRoot, uncomment this line and set it to your forum component directory.
# RewriteBase /forum-stub-directory/
# If you are having problems with the rewrite from content/ to content.php, uncomment this line to turn MultiViews off.
# Options -MultiViews
RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [NC,L]
# Forum
RewriteRule ^threads/.* showthread.php [QSA]
RewriteRule ^forums/.* forumdisplay.php [QSA]
RewriteRule ^members/.* member.php [QSA]
##################################################
RewriteEngine on
RewriteRule ^f.txt vbmaps.php?cat=d [L]
RewriteRule ^t([0-9]+).txt vbmaps.php?rss=d&page=$1 [L]
RewriteRule ^tag([0-9]+).txt maptag.php?rss=d&page=$1 [L]
RewriteRule ^t([0-9]+).txt vbmaps.php?rss=d&page=$1 [L]
RewriteRule ^tag([0-9]+).txt maptag.php?rss=d&page=$1 [L]
RewriteRule ^forums maps.php?cat=d [L]
RewriteRule ^thread([0-9]+) maps.php?rss=d&page=$1 [L]
RewriteRule ^forums.xml maps.php?cat=d
RewriteRule ^thread([0-9]+).xml maps.php?rss=d&page=$1 [L]
RewriteRule ^t([0-9]+)\-([0-9]+)\.html$ showthread.php?t=$1&page=$2 [L]
RewriteRule ^f([0-9]+)\-([0-9]+)\.html$ forumdisplay.php?f=$1&page=$2 [L]
RewriteRule ^post([0-9]+)\.html$ showthread.php?p=$1#post$2 [L]
RewriteRule ^t(.*).html showthread.php?t=$1 [L]
RewriteRule ^u(.*).html member.php?u=$1 [L]
RewriteRule ^f(.*).html forumdisplay.php?f=$1 [L]
RewriteRule ^f(.*)-t(.*) showthread.php?t=$1 [L]
RewriteRule ^t([0-9]+)\-([0-9]+)$ showthread.php?t=$1&page=$2 [L]
RewriteRule ^f([0-9]+)\-([0-9]+)$ forumdisplay.php?f=$1&page=$2 [L]
RewriteRule ^post([0-9]+)$ showthread.php?p=$1#post$2 [L]
RewriteRule ^t([0-9]+)$ showthread.php?t=$1 [L]
RewriteRule ^u([0-9]+)$ member.php?u=$1 [L]
RewriteRule ^f([0-9]+)$ forumdisplay.php?f=$1 [L]
RewriteRule ^t([0-9]+)\-([0-9]+)$ showthread.php?t=$1&page=$2 [L]
RewriteRule ^f([0-9]+)\-([0-9]+)$ forumdisplay.php?f=$1&page=$2 [L]
RewriteRule ^post([0-9]+)$ showthread.php?p=$1#post$2 [L]
RewriteRule ^t([0-9]+)$ showthread.php?t=$1 [L]
RewriteRule ^u([0-9]+)$ member.php?u=$1 [L]
RewriteRule ^f([0-9]+)$ forumdisplay.php?f=$1 [L]
RewriteEngine On
RewriteRule ^t(.*).html showthread.php?t=$1 [L]
RewriteRule ^f(.*).html forumdisplay.php?f=$1 [L]
RewriteRule ^u(.*).html member.php?u=$1 [L]
RewriteRule ^(.*)-post(.*).html showpost.php?p=$1&postcount=$2 [L]
RedirectMatch 301 thread(.*).html$ http://www.site.net/vb/showthread.php?t=$1
#########################################################
RewriteRule ^((urllist|sitemap_).*\.(xml|txt)(\.gz)?)$ vbseo_sitemap/vbulletin_sitemap_index.xml.gz [L]