I'm afraid without coding you can't do that. If you want to do that using code then you have to write trigger code on before delete operation
trigger onParentObjectDelete on CustomObject__c (before delete){
List<Id> idsToQuery = new List<Id>{};
for(CustomObject__c a: Trigger.new){
idsToQuery.add(a.id);
}
//query all child records where parent ids were deleted
ChildObject__c[] objsToDelete = [select id from ChildObject__c where ParentId__c IN :idsToQuery];
delete objsToDelete; //perform delete statement
}
I'm afraid without coding you can't do that. If you want to do that using code then you have to write trigger code on before delete operation
trigger onParentObjectDelete on CustomObject__c (before delete){
List<Id> idsToQuery = new List<Id>{};
for(CustomObject__c a: Trigger.new){
idsToQuery.add(a.id);
}
//query all child records where parent ids were deleted
ChildObject__c[] objsToDelete = [select id from ChildObject__c where ParentId__c IN :idsToQuery];
delete objsToDelete; //perform delete statement
}
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