Flat list module to module with key made from the flat lists

I have a module dimensioned by 4 flat lists. A line item in this module creates a key using 3 of these flat lists.

I have another module dimensioned by the key and the 4th flat list. How can I map data from first module to the second module?

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Modeling

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You need to use the lookup function.

Module 2:

Dimensions: Combined Key, 4th dimension

Breakdown Combined Key to it's 1st, 2nd and 3rd dimensions

Then do a lookup

Module 1.LineItemX[Lookup: 1stKey, Lookup: 2ndKey, Lookup: 3rdKey]

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