Dropping Tables
You can drop either single tables or multiple tables in batch, as follows:
1.Do one of the following:
•To drop a single table, right-click it in the Online Browser and select Drop Table from the context menu.
•To drop multiple tables, right-click the "Tables" (or "User Tables", if applicable) folder, and select Drop tables from the context menu.
A change script is generated in the Database Structure Change Script Window, and the tables are marked for deletion, which is indicated by the 
icon. At this stage, you can still revert the changes by clicking the Refresh 
button in the Online Browser.
2.Click Execute Change Script 
to commit the changes to the database.
See also Dropping Database Objects.