T-code for Where used list, to find the field used in different tables

Just click F1, click on technical info push button,
double click on data element
click on where used list icon
in the popup screen click on tables/structure/function module and click on ok...

You will get the list...of tables, views, or function module....

in addition to find the tables and fields to use be below TCodes

SE11 - ABAP Dictionary info
SE16 - Data Browser table
SE15 - Repository Information System
SE12 - ABAP/4 Dictionary Display