Welcome to the forum @manjeshhb!
To be perfectly honest, thinking in terms of tables, especially if you want to update the database, will work against you in Kinetic. Learning what’s in the tables is a very valid pursuit, but in the 17+ years of working with Epicor products, I have learned that it is a service oriented package more than a database package. I treat it more like Microsoft Exchange. I would never just add data to tables and expect to work not knowing what Microsoft coders do. If I want to add a new supplier or manufacturer, I use the service, which is with a .NET object in Functions/Directives or REST with the UI and external programs.
There’s an on-going conversation on how to export customizations, and @klincecum has written some code to do the export but there is no importing back in at this time.