I’m afraid it’s not that simple. The TVs have to be tied to a template (or templates).
Clear the Site Cache first.
You should be able to edit each TV in the Manager and assign it to one or more templates. If not, you’d have to edit the site_templvar_templates table to hook them up. You definitely *don’t* want to import that table because the ids won’t match.
Then, you’ll have to edit every document that uses a TV to set the value of the TV for that document (unless they’re all set to @INHERIT).
Then, clear the site cache and you should be ok (unless I’ve forgotten something).