You can use the variation rates option for maintaining price changes.
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Click Financials - Variation Rates on the menu.
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Click Add Row to create a new variation rate.
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Click Rate Type and select a rate type.
Alternatively, type the rate type if it's not available in the list.
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Type the rate type description in the Short Description and Description cells.
You can change the description that is populated from the selected rate type.
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Click Quantity Unit and select a quantity unit.
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Type a value in the Rate Value cell.
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To change the currency, click Currency and select a currency.
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Click Save.