Hi all,
       Here is the my requirement,i have two objects known as A and B,having lookup relationship In the A object i have 3 fields known as Xamt,Yamt,Zamt and in the Bobject i hv one currency field with amount and one picklist with x,y and z.when i choose x and enter amt value in the B object then that should be effected to XAmt in A object.this requirement should be done with trigger