Once you add a table it's Id will be shown in the "Table" section in the left pane (highlighted in the below image).
And if you associate that table with table option in Pixel Perfect Report then the ID will displayed once again as shown in the below image,
In this way you can identify various tables. Hope this helps!
Thanks for reply, but i have to mention that, i am using NPrinting 17.2.0 with qliksense 3.0 , with this combination, we are not able to find table objects, we can only pull or find fields preceded by F/objectID and graphs/chart (like pie and bar) preceded by o/objectID. otherthen this we wont find table objects.
This might be a bug or i might be not knowing some information regarding this.