How to apply a tier based discount on total contract value of a subscription

Summary:

for a given subscription , with 1 subscription line (product) we need to apply a discount based on total contract value

this discount must be a % based of total contract value range

as example

between 1000 and 2000 1%

between 2001 and 3000 2%

….

Same question with potentially many subscription lines (product) of a given subscription

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