Hi Mayank,
I don't think that there is a such features, but I'd wait for an official reply from Delphix. However what I'd suggest you is to enter in "Edit ruleset" from the ruleset list and then, in the new page, click again the "Edit Ruleset" button in the top toolbar and then wait for the list of tables will be refreshed: select the "Select all" checkbox and save the selected tables. DO NOT save the selected table when a filtering of table is active: you can risk to deselect all other tables not listed.
While this operation is very easy, the very big problem is updating the inventory with the domains/algo association. You could use the profiling job to re-discover new sensitive columns or you should have a deep knowledge of the changes of your schema.
Regards.
Gianpiero