Hi,
You want to replace /4E8 with 4110 ?
1. Query /4E8 then make value of /4E8 to zero and store , then assign amount as 4110 and pass the value to /4E8 and store .
What is the condition if there is no 4110 ?
2. In case nothing to be done if there is no 4110 then you have to do query for existance of 4110 in the rule then do the first step.
Regards
Sujith