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By default, LUSID separates holdings at the instrument level, i.e. two transactions in the same instrument will contribute to the same holding. This also applies to cash, where separate holdings (balances) are created for each currency.

There are various instances where it is desirable to separate the holdings further:

The sub-holding keys that LUSID will use to generate the holdings are registered when the portfolio is created. Subsequently, they can be modified using the LUSID PatchPortfolioDetails API.

The values for these sub-holding keys are then provided at a transaction or holding level when these are loaded into LUSID.