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...
And you would use Dashboard actions to drill through. sheet swap etc.
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.