Changing the control for field 'Release'

[Ravi Ranjan]

Hi,
I am using GNATS v3.113. The control for field is 'Release' is EditBox.
May I change this EditBox control to 'ComboBox'? 
If yes, please let me know how?
I need this because my requirement is to restrict user to select from
a set of available data for this 'Release' field.

Thanks,
Ravi Ranjan
MphasiS India 
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