Round to thousands | AWK

function rounding(var1){
    a = var1+500
    b = int(a/1000)
    return b
}

BEGIN{
    FS="|"
    OFS="|"
}
{   
     print $1,$2, $3, rounding($4), rounding($5), rounding($6), rounding($7), rounding($8),rounding($9),rounding($10),rounding($11),rounding($12)
}