Best Way to Copy Data in Hybrid ASO

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Hi,

I have a requirement of Copying data from a Non Level 0 combination in a Hybrid BSO to a Level 0 Combination. This means copying data from Parent Combination of many Sparse Dimension which are set to Dynamic Calc to Level 0 combinations of those dimension.

I haven't been able to figure out the best way to do it quickly and efficiently. 

I've tried to keep the Target Combination in Fix and then do a LHS = RHS within a block. But, it somehow doesn't show the result. Might be block creation issue. 

I have also tried keeping source combination in Fix, but then, it just makes the BR takes hours to execute.