User types in the Editor window a query or statement then presses "." or dot and a window appears to assist in inserting the database object name. For example,
select * from dbo.
will open a list of all objects belonging to dbo. However there is no way to filter out objects you're not interested in. For example user wants to only list tables because stored procedures would not make sense in this type of SQL query.
Enhancement request CR0223790 has been submitted to Development for consideration in a future release of Toad for SQL Server.