Dont show Data on main or sub when subform has all data entered

[rooterr]

I have a form where project data is edited. I have a main form with the project summary, people working on the project, and a subform that lists the project steps, target and complete date for each step. If the complete date for any one of the steps is null. Then I want all of the record on the subform and main form to show. If complete dates for all the steps are entered. Then I don't want any of the data on the main or subform to show. How do I do this.

Thanks,

 

[MikeDNova]

please state again in english,
it hard for me to understand what you write

thanks