Assigning records to the mask based on field value.

Hi experts,

I have a Item status field in the main table. It has the values "Approved" and "Unapproved". To some of the records

the status value is "approved" and for some the status is "Unapproved" and later these statuses would be changed..

I should create a mask only with the approved records.i., mask should contains only the approved records.

can anybody suggest me how to assign only approved records to the mask , how can i validate the field for mask ?

Thanks & Regards

Sireesha.