When you want to "convert" a specific extension into a shared extension, you have to first check which tables must be shared.
You can find their definition when you go in JMS templates and have a look in the "sharing" tabs where you "open" the extension that you expect to share.
If you have "joomla users" and perhaps other tables that are required in addition to the tables of the extension itself, you have to check if you already have these tables shared (very important concerning the joomla users that can only shared when you create the slave site).
In the particular case of JCal Pro2, there is only a specific tables and no dependencies.
So you can uninstall this extension and re-install with sharing.
You can use the JMS tools for that.
When proceeding with such operation, it is recommended to have a backup of your DBs.
Of course, when you uninstall an extension, you will lose their data.
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