How to modify Table Existing method in D365

This method is use to modify existing method of table , here i am going to use 

Sales Line method initfromSalesQuotationLine.

in this case i am going to use Chain of Command. this is very useful Technic to modify existing mathod.

1. create new class with _Extension

2. use Extensionof for your table which you want to modify

3. use this mathod according you REQUIREMENT. 

Check the method in table

[ExtensionOf(tableStr(SalesLine))]

final class AksExtensiontablemath_Extension

{

   

    // this mathod is used to fatch data from sales quotation table to sales line after SQ confirmation

    public void initFromSalesQuotationLine(SalesQuotationLine      _salesQuotationLine)

    {

        next initFromSalesQuotationLine(_salesQuotationLine);

        this.Aks_givenDiscount = _salesQuotationLine.Aks_GivenDiscount;

    }

}

Thanks

Akshay