You could use the ‘Database Project’ functionality as described below:

1. Select ‘File → New → Blank Project’ from the main menu.
2. Drag’n’drop the connection from Database Explorer onto Project Explorer (select ‘View → Project Explorer’ from the main menu).
3. Drag’n’drop the specified tables from Database Explorer onto Project Explorer.
4. Save the project by selecting ‘File → Save NewProject As…’ from the main menu.

Now, whenever you open the project, you will have your favourite tables in a convenient place.

Please also see the ‘Managing Database Projects’ node in the product’s Help documentation.