Custom Button to fill out field

Good afternoon,

I have multiple record form that has a Week Ending Date field. This form can display a lot of records and the Week ending can be the same for all records. I was wondering if there was a way to create a button to fill the file of the selected records or if anyone has another thought on how to accomplish this. I am just looking to save some time for Data entry.

I should add that I can accomplish what I want if I sue a control form before loading the multiple record form, I was just seeing if there was another way.

Thanks,

Keith