Custom Filters are a set of named criteria that allows you to select only specific entries in a view. Default filters will be created for single-select, multi-select and date fields. You can create custom filters with AND/OR operators or a combination of both, using Deluge Scripting. 

The following code is the view definition of Application Form View. The custom filter named "Diploma/PostGraduate" is created with the required criteria. This filter will be listed in the Filter list box in your view.

list "Application Form View"
        {
        show all rows from Application_Form
              (
              Name
              DOB
              EducationalQualification
              Experience
              )
       filters 
        (
        
        "Diploma/PostGraduate" : ((EducationalQualification == "Diploma" && Experience == "2 years") 
|| EducationalQualification == "PostGraduate")
        )
}