Adding the column as street name2 in Address tab of custtable ,the combination of streetname & street name2 i will be displayed in address grid how to do that

Hi …this is suma

i can add a column in the address tab of Customer form. Column name as street name2 in the address tab ,i want the address i.e combition of street name and street name 2 exhibited into the bottom of Address grid of customer form. how to do that, can any one solve this…if anyone unclear about this could u plz inform to me…