Selling price on split order lines

Hello there,

Seek your advice on the best practice to mange the selling price on sales order in case the unit price is associated with quantity threshold and order line is allocated to multiple location/lot # (so-called split lines).

-- Order line with Item A , unit 1000 with unit price $1 (below unit 1000, the unit price is $2)

-- Due to stock available in multiple location/lot , system splits the line into multiple lines with different location/ lot number , the unit price keeps as it was

-- In case the request date is changed or lot number change, user manually overwrite the schedule pick date or promised delivery date , and/or lot number, system recalculates the unit price based on the split line quantity to unit price $2.