I'm making a session application form. 

We have 2 sessions before we start our service

1. public session (about 10 partipants)

2. private session (1 participants)

=> start our service

After public session, we arrange participants'/our schedule 

and decide the day of private session.

Now I've finished creating public session application form and its report.

and I added custom action 'apply for private session' to the report.

When I click 'apply private session' button, 

I want to move to private session application form 

AND 

take over some values from public session report(name, tel, email, etc..) to private session application form.

By using 'openurl' method, I can open private session application form,

but I cannot set initial values to that form.

Could someone tell me how to open another form with some initial value?

or any good ideas for this kind of problem?

Thanks 

Tadashi