To create a new table on the local database,
if you are using Oracle Navigator you can:

(Navigator is the first screen you see when you open Personal Oracle7. It functions like the Windows 95. You can use Navigator to access data connections, database objects, all projects),

• Right-click the Table folder under Local Database on the left side of the Navigator.
  1. A list of options appear.
  2. Click New. The New Table dialog appears.
  3. To create the table using the Table wizard, click use Table Wizard and follow the instructions.

• Click Create table and click OK.
  1. The New Table property Sheet appears.
  2. Type the table name in the Name field.
  3. Click the down arrow in the Owner field and select the owner from the list.
  4. Click the Design tab. The Design page appears.
  5. Fill out the table grid. Click OK. The new table appears in the list on the right side of Navigator.

you can click here :CREATE A TABLE