Yes you can symlink them.
Although I'm not sure why you have installed the server in /usr/local/
For next time, I'd recommend using the standard installation paths for your software.
Here's a breakdown of the files/folders used in Apache 2.2 Web Server that I found really helpful:
The new version of Apache 2.2 means that there is a different file structure for its configuration files.
<strong>apache2.conf:</strong> the main Apache2 configuration file. Contains settings that are global to Apache2.
<strong>conf.d:</strong> contains configuration files which apply globally to Apache2. Other packages that use
Apache2 to serve content may add files, or symlinks, to this directory.
<strong>
envvars:</strong> file where Apache2 environment variables are set.
<strong>httpd.conf:</strong> historically the main Apache2 configuration file, named after the httpd daemon.
The file can be used for user specific configuration options that globally effect Apache2.
<strong>mods-available:</strong> this directory contains configuration files to both load modules and configure them.
Not all modules will have specific configuration files, however.
<strong>mods-enabled:</strong> holds symlinks to the files in /etc/apache2/mods-available.
When a module configuration file is symlinked it will be enabled the next time
apache2 is restarted.
<strong>ports.conf:</strong> houses the directives that determine which TCP ports Apache2 is listening on.
<strong>sites-available:</strong> this directory has configuration files for Apache2 Virtual Hosts.
Virtual Hosts allow Apache2 to be configured for multiple sites that have
separate configurations.
<strong>sites-enabled:</strong> like mods-enabled, sites-enabled contains symlinks to the
/etc/apache2/sites-available directory.
Similarly when a configuration file in sites-available is symlinked,
the site configured by it will be active once Apache2 is restarted.
See here for more help on apache2 config: https://help.ubuntu.com/10.04/serverguide/C/httpd.html