How to generate a CREATE script for several tables in pgAdmin III?

"pg_dump" is also an option here. The -s flag for schema-only and -t to select specific tables. It's not psql or pgAdmin though. It's a utility available to the PostgreSQL user. Example:

sudo su - postgres
pg_dump -s database 

Here's a way using pgAdmin.

• Right-click on your database (or schema).
• Choose "backup"
• Under "Format" choose "plain"
• Under "Dump Options #1" choose "Only schema"
• Under "Objects" choose the tables you want.

Then click "backup". The output should be a plain text file with the create table statements.

Here's the PgAdmin documentation on backup.