How to set Group box widget and group items by attribute Name

Hi Everyone, I use GroupBox widget within my app, so  I want that Content will be grouped by “Attribute = Title” and  one ore more content can have a same title.  But when I try to add new content with the same title, the previous content  is deleted.  I would like to have content incremented when I add new content with same title and group it by title name.     Could anyone tell me how to set it ? Thanks in advance,      
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