Enable/ Disable paramters based on another parameter - SPECIAL ValueSet

Hi Guys
I have a requirement to enable and disable the parameters of a concurrent program.....

The requirement is I have four date parameters
1. From Date
2. To Date
3. Original From Date
4. Original To Date

and also an ORG_ID parameter in my concurrent program

So i want From Date and To Date = DISABLED and Original From Date and To Date = ENABLED when ORG_ID= 123

and  From Date and To Date = ENABLED and Original From Date and To Date = DISABLED when ORG_ID <> 123

How can you achieve it using DUMMY.... do we have to use special VALUE SET.....if so can you please share with me the piece of code with a small example on how to disable and enable both sets of date parameters