Which tables are available in a portal is determined by the configuration of your users table in Airtable. Have a look at this article to learn how to set it up! Once you have set up your users table, you just need to add the tables in the Tables section. A dedicated menu item for each table in the portal will appear in the portal header.
You can choose which tables are shown to different types of users as explained in this article.
You can also choose a lookup field that displays a linked record field as a portal table, but note that this type of portal table does not support record creation.
💡Tip
Linked records can be made clickable to show information from other tables as well.