Passing opportunity ID field to activity task screen

Hi Experts,

We want to show Opportunity ID field in activity task header screen. So the scenario is Opportunity ID should be stored in a extension field created in Task header screen.

So this is like passing the standard field value from one business object to another.

I tried doing this with the help of process extension scenario but no such scenario exists.

In our case we are creating Opportunity and then a new task as follow up.

How can I do this ? Request you to kindly help .

Regards,

Saurabh Sharma