for(MasterConfiguration__c conf : [SELECT Section_Label__c,
              ColumnsPerSection__c,
              OrderOfSection__c,
              Object__c,
              SectionName__c,
              TermsOfSubmission__c,

              (SELECT FieldNameAPI__c,
                      Object__c,
                      FieldLabel__c,
                      OrderOfField__c,
                      DefaultValue__c,
                      HelpText__c
                 FROM Master_Configurations__r
                WHERE RecordType.DeveloperName = 'Fields'
                  AND Object__c IN ('Case', 'Service_Information__c')
                  AND Inactive__c = FALSE
                  AND HiddenOnCaseDetail__c = FALSE
             ORDER BY OrderOfField__c)

         FROM MasterConfiguration__c
        WHERE RecordType.DeveloperName = 'Section'

          AND ((CaseRecordType__c INCLUDES ('AAA')
          AND (CaseCategory__c = '' OR CaseCategory__c = NULL)
          AND (CaseSubCategory__c = '' OR CaseSubCategory__c = ''))

          OR (CaseCategory__c = 'Heath'
         AND (CaseSubCategory__c = 'My Health'
           OR CaseSubCategory__c = '')))

          AND Inactive__c = FALSE
          AND Object__c = 'Case'
          AND HiddenOnCaseDetail__c = FALSE
     ORDER BY OrderOfSection__c] )

Case c = new Case();
c.Category__c = 'Heath';
c.SubCategory__c = 'My Health';
c.RecordTypeId = Schema.SObjectType.Case.getRecordTypeInfosByName().get('Health').getRecordTypeId();
c.AgreedToTerms__c = true;
c.Status = 'New';
c.SubStatus__c = 'Request Submitted';
c.Receipt_Date__c = Date.today();
c.Origin = 'Email';
c.ProjectName__c = 'Testing';
insert c;