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sprnsprn 

Establish relationship between a picklist field and a formula field.

Hi,
 
I have serious issue came up in my way. My company uses various opportunity custom fields in the SFDC platform. Now the issue i have is, I need to create a relationship between a picklist filed with two formula fields.
 
The idea is, whenever i'll select a value from picklist files, for ex: here 'Type of deal' is a picklist where it contains many values. But when user will select the value 'evaluation' on the edit page, then the 'evaluation expiration date' field (formula field) will show up in the detail page. For selecting other values in the picklist field, the formula field should be hidden.
 
Do you have any idea how this can be implemented in my org?
 
Please let me know. Any of your suggesstions will be highly appreciated.
 
Thanks.
 
Su.