Use a portal with a filter expression that only permits related records with "declined" in the status field.
Most often, the relationship for such a portal would be defined similar to this:
LayoutTableOccurrence::anyField X PortalTableOccurrence::anyfield
This matches any record in the layout's table to all records in the portal's table. The portal filter then omits all records except for those where the status field = "Declined".
These both use the same table though (TCM is the table name).
So, TCM::First Name is a field. TCM::CC Approval Status is the other field. How do I do it if they are in the same table? Can you give me an example using those two fields for CC Approval Status = DECLINED?
You can relate a table to itself. This is called a "self join".
Open manage | Database | relationships and click TCM to select it. Then click the duplicate button (two plus signs) to make a new table occurrence of the same data source table. You can double click this new occurrence box to open a dialog where you can change the name of the new table occurrence from TCM 2 to something more descriptive such as AllTCM or some such.
You can then create your relationship by dragging from any field in TCM to any field in AllTCM. Doubleclick the relationship line to open a dialog box where you can change the default = operator to the cartesian join operatoer (X).
Now you can add your portal to your layout and use:
AllTCM::CC Approval Status = "Declined"
as your portal filter expression.
Note, since your layout is based on the TCM table you don't have to use a portal. I suggested that option because you wanted to "list it in a box".
You can also set up this layout as a tableview or list view layout and just perform a find for all records where status is declined to list the exact same records. It just isn't a list you can display in a box like you specified.
You may find this tutorial on table occurrences helpful in better understanding how they control the function of FileMaker database Tutorial: What are Table Occurrences?