In a spreadsheet, a header row that uses the keyword CALL to identify the allocation proportions column is required.
The allocation proportions can be assigned at any level.
The allocations do not need to sum to 100 (i.e., they do not need to be percentages), they are simply relative proportions. For example, if a group had two component series, A and B, and you assigned A a weight of 2 and B a weight of 1, then series A would get a two thirds allocation and series B would get one third.