Hello Guys...
Pls Help Me for this...
1. Create custom object with label 'Demo Object' and API name Demo_Object.
2. Create a 'text' field with label 'Category'.
3. Create a 'lookup' field for 'Opportunity' object.
4. Write trigger for custom object. On insert of custom object record if the value of 'Category' field is equal to 'Opportunity' create a new opportunity record via trigger.
   The opportunity lookup needs to be populated with this new opportunity.