ASO MDX formula optimization or different method

Hello All,

We have an ASO application where we have  requirement that level zero members should be mulitply the value according to formula and the parent member should be summed .for Example

in the below formula it shows for the level zero members it is should perform cu cumulative * Production units for the extended cost up and for the parent level it should sums the level 0 data to the Extended cost up

case

when

islevel(period.currentmember,0) and

islevel([Destination].currentmember,0) and

islevel([ModelYear].currentmember,0) and

islevel([Version].currentmember,0) and

islevel([Parts].currentmember,0) and

islevel([Supplier].currentmember,0) and

islevel([PMSCategory].currentmember,0) and