The concept of JMS is based on the sharing
- Sharing of the same Joomla application (php code)
- Sharing of the content of a limited number of extensions. (MySQL tables).
To help doing the setup of slave sites, JMS is delivered with several JMS Templates rules that use our default recommendation as explained in several powerpoint present in our documentation (ie.
www.jms2win.com/en/documentation/doc_det...-day-strasbourg-2012)
You can install JMS on an existing website event if we recommend to keep the master websites empty and without any data.
In general, we recommend to consider the master as a repository or a library where you just install the extension without any data.
After that, you create the slave sites that will use the Joomla php code present in the master.
You mentioned that you have 2 existings /2013 and /2014 websites.
The problem is "existing".
As you need to share the same joomla application (php code), if you want to "import" the current existing website to convert them into a slave site, this mean that you have to ensure that the existing website use exactly the same Joomla version and extension that are present in the master.
In effect, as you will remove all the PHP code from the slave site to re-use the one present in the master, you need to have the code present in the master with exactly the same version (to be sure that the DB structure or layout of the MySQL tables are identical).
If this is the case, you will be able to create slave sites into the master to receive the existing /2013 and /2014 directories.
You will be able to re-use your current "configuration.php" to re-use the current DBs.
The additional thing to which you will have to take care when "importing" existing website as slave site is the specific files and folders on the disk like "images", media, video, ...