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I have the same question (0)Hi John,
Step to create sum index field:
1) Create field of datatye as Decimal.
2) Got property window(SHFT+F4).
3) Change FieldClass as FlowField.
4) Click on value of CalcFormula.
5) In CalcFormula. window: select Method sa Sum.
6) Select Table from you want to calculate Sum.
7) Select Field as decimal field which you value you want to sum.
8) But table filter properly properly.
9) Click on OK.
10) This will give you sum value from another table with proper filter.