Dependent Picklist Values in Salesforce?

Hi guys,

I have defined a custom picklist field on an object, now I want that the picklist values are dependent on another field of the same object.

For example:

Picklist values: {A,B,C,D,E}

if value of Price field (of type number) is 10 then, the picklist values available should be {A,C,E}

else all of  {A,B,C,D,E} should be available.

Thanks in advance