The actual expression you should use will depend on the field (and group) names you are using.
But if the Total Value expression is: sum (Value)
The % expression will be:
Sum(total <GroupName, Stage, Bucket> Value) //Where GroupName should be replaced by the name of the cyclic group on your chart.
Hope this helps,
Thanks for your answer. But it seems like the expression is not
taking the cyclic groups' name. In return its gving me all zeros.
This is what I wrote in the denominator of the expression.
total <[Group 1],STAGE, Bucket_Test> [TOTAL_VALUE])