Copy duplicate series which has client expression

Hi,

I have series A which has client expression,want to copy same value to another series B.How to create series B?

I have created with Create As option and given source exp in B as Sum(nvl(internal_name of A,0)) but it is showing as 0 in front end.

Series A properties are as below

Proportion calculation series- A

Copy/Paste Preservation type- Volume preservation

Move Preservation - Do Nothing.

Created series B  as

No proportional

Copy/Paste Preservation type- Most Common

Move Preservation - Most Common

Both are CTO series

I did anything wrong?Please help me