All, I think the question is effectively:
"how to perform 3D SUMIF with variable number of sheets"
If so then the reality is such that neither 3D referencing nor individual cell aggregation will suffice.
Performing conditional calculations in 3D is non trivial, inefficient and are invariably volatile.
If you want the sheet listing to be adaptive then in terms of the standard 3D approaches things are further complicated.
Questions:
1. are all sheets (with exception of summary itself) to be included in the aggregation ?
2. are you willing/able to use VBA ?
@blake7: re:
=SUM('PROPERTY 1'!D3+'PROPERTY 2'!D11+'PROPERTY 3'!D20)
note the use of SUM negates need for + within the SUM and vice-versa, either:
=SUM('PROPERTY 1'!D3,'PROPERTY 2'!D11,'PROPERTY 3'!D20)
or
='PROPERTY 1'!D3+'PROPERTY 2'!D11+'PROPERTY 3'!D20
the "advantage" of the former is that it does not explicitly coerce the precedents ... using + within the SUM removes that benefit
though again to reiterate I don't think this is a viable approach in this instance.
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