Automatic updation of Price for Precious Material

HI,

We have a Scenario like Precious material ( Gold , Platinum),

WE Have to give the price manually at initially, later when ever price will change it has to update automatically,

EX: In MM this same Scenario is there like

Condition type GUA1 for initial price

Condition type GUA2 for Updated price,

When ever we will update the GUA2 it will take that price only.

Is there any scenario for SD to full fill this requirement,

Please do Need full

Thanks & Regards,

Gangi