I have a report (SSRS) with two tables and two data sets, first table(tablix) to load grouped data and second table(tablix) to load detailed data.
I would like to click dynamically, when I click on the first table of a record, it shows only the details of that record selected in the second table, is that possible?
If you mean you want to show two tables on screen at once and refresh only the second one when an item is clicked in the first table then no, you can't do this natively in SSRS.
There are two ways of doing something similar.
None of these will give you exactly what you want, hopefully one of them might be an acceptable alternative.