Loop in BPC script logic

The *FOR / *NEXT statement is used for loop purpose in BPC script logic, one task we need to achieve is to carry over value from first loop to second loop. for example the following script will loop from Jan to Mar, how could I pass the value e.g. planning amount for Jan to second loop Feb and so on. in ABAP or FOX it's a basic thing done by define a variable and pass that value to the variable, anybody know how to do this in script logic?

*FOR %month% = 2006.JAN, 2006.FEB, 2006.MAR

*NEXT