> ## Documentation Index
> Fetch the complete documentation index at: https://docs.conductor.is/llms.txt
> Use this file to discover all available pages before exploring further.

# The Subtotal Item object

> A subtotal item calculates the sum of all items above it on a sales form, up to the previous subtotal. This is particularly important for applying discounts because discounts can only be applied to the line directly above them, requiring items to be subtotaled first.



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