I want to add shost descprtion data in descprtion

[aggarwaltan]

I want to use business  rules in which when we save the  incident as a result short description data should copy into Description data  . 

[Murthy Ch]

@aggarwaltan 

have you tried anything?
You can make use of before insert BR on your table.

Get the value of the fields using current object something like below:

current.field_name; // in your case it will be current.short_description

Let me know if you stuck anywhere