Congratulations, your client has picked the right software for the right job!!
Underlying data can be viewed from any graph, table etc. just by right clicking...
Viewing Underlying Data | Tableau Software
And you would use Dashboard actions to drill through. sheet swap etc.
Adding Actions to Dashboards | Tableau Software
I would suggest a quick browse through Tableau Public (or this forum) for loads of great examples.
Does that give you enough?
Thank You Mark. I appreciate for the quick response. I have a numerous doubts since i'm new to this tool. I will have to deep dive to know more i think.
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Retrieving data ...