Grouping by 2 different fields in one expression

Hello

I am new to report builder 3.0 and also new to the forum.

I currently have a report with the following calculated field used as a series in a graph:

=iif((Fields!IncidentStatus.Value="Open") Or (Fields!IncidentStatus.Value="Suspended"),"Open","Closed

Which works fine but I now need to add in "new calls" to the graph. A new call is anything with a Fields!IncidentCreatedDate of yesterday. Any ideas how I would add this in to the calculated field?

Thanks!