To configure how many decimals will be used and shown for my Sales Price in all the calculations and for the according surcharges you can follow the steps below.
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After selecting a value between 0 and 9 for the field "Sales Price decimal places" you can proceed with step 2.
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To be able to show the decimals selected also in all fields you need to go to Setup > Manage Currencies and select for each Currencies you are working with "Edit".
Afterwards enter the number of decimal places you want to see for the currency fields in Salesforce.
