Delete selected comments of a particular node?
You can do this with Views Bulk Operation module. Follow the steps:


Install Views and Views Bulk Operation modules and enable these modules.
Create a View of Type "Comment".
Change the Views Format show from 'Comment' to 'Fields' under Format section.
Change the Views Format from 'Unformatted list' to 'Table'.
Add Bulk Operation:Comment, Comment:Title and Content:title fields under Fields section.
In step 5 When you chose Bulk Operation: Comment select Delete Item under SELECTED BULK OPERATIONS setting.
Add Content: Title filter criteria and expose this filter So that you can filter comments of a particular node.