Hi Bhupendra,
To use a weighted allocation, the column with the weighting factor (in your case, a percentage or ratio) must be in the destination data set. You cannot weight a value based on the source data set.
Perhaps this artcile will give you the answer you need:
https://community.apptio.com/viewdocument/weighted-value-allocations?CommunityKey=15f4e51d-d06f-4641-94c5-f2598d137d06&tab=librarydocuments
#CostingStandard(CT-Foundation)