Dear All,
I am going to add new fields and methods in Standard Table "SalesTable".
As i know if we wants to work on Standard Objects , we need to use always "Extension".
In Data Model , we have Table Extensions node and i saw SalesTable.Extension is already there.
I saw in Table "SalesTable" we have an option create extension :

And in Table extensions > SalesTable.Extension are also there :

Kindly elaborate me the best approach to add fields and methods in Standard Table.
Please give me more shed on this.
Thanks!
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