@MALLIKHARJUN  There is no shortcut to delete.  When you create a Data Type following rule will be created:-

1. Class

2. Database table instance

3. Properties (If you added for the Data Type) 

4. Data Page (Page Type, List Type, Savable )

5. Report Definition

Therefore to Delete, you have to delete in the following order

1. Properties 

2. DataPage

3. Report definition 

4. Class

5. Database table instance 

Note: The table which got created in backend you have to delete via executing SQL Querry on DB or by requesting to your DB administrator