If you enable Qualify Name, the specified name is used to qualify the object names in the generated SQL statements, e.g. with FOO as the qualifier and a table named BAR, the INSERT statement is generated like this:
INSERT INTO FOO.BAR ...
If you want to export just a subset of tables, select only the tables you want to export in the Object Types tree.
Is there any better documentation or a reference on how to use the Qualify name option when exporting a schema to SQL? I would like to export a subset of tables and I am guessing that this would be a way to do that.