already sum in expression

[capriconuser]

i have a filed "Amount" in that i already done this in script

load

id, 

sum (amount)

from abc

group by id 

now i am trying to add expression like this 

({<id={'1'}>} amount)

but this does not work any help 

here in expression i dont want to add sum because this  sum is already in script 

[capriconuser]

i already applied sum on amount field t hey when i apply sum on code_name?