Setting an alias via htaccess?

Question

Apache HTTP Server

There is an address:
site.ru/test/stores/forum
, an alias is registered for it:
forum.site.ru
, the following rules are used:

RewriteEngine On

RewriteCond %{HTTP_HOST} ^www\.site.ru [NC]
RewriteRule ^(.*)$ http://site.ru/$1 [R=301,L]

RewriteCond %{HTTP_HOST} ^www\.forum.site.ru [NC]
RewriteRule ^(.*)$ http://forum.site.ru/$1 [R=301,L]

RewriteCond %{REQUEST_URI} !^/test/stores/forum
RewriteCond %{HTTP_HOST} ^forum.site.ru$ [NC]
RewriteRule ^index\.php(.*)$ /test/stores/forum/$1 [L,QSA]

everything works fine, when requesting forum.site.ru, it sends us to the site.ru/test/stores/forum/ folder and at the same time the address changes to forum.site.ru
, but if we go further (added to the /test1/ address) :
site.ru/test/stores/forum/test1
then stops processing the address of the form:
forum.site.ru/test1
-----
tell me what needs to be added so that when the alias is substituted, the rest of the address works fine?

Answer 1

And this is because the mat part of my friend you don’t know well
1 option RewriteBase / is in your hands
Option 2
Option 3
change to
RewriteCond %{REQUEST_URI} !^/test/stores/forum.*

Answer 2

Good afternoon!
I have a similar situation. What is being said here, does it download the “.htaccess” file, which is located in the “site.ru” site folder?
And what should be written then in “.htaccess” inside the site folder “forum.site.ru”?