The "Group Sign-Off" custom field originates from an App which your client's instance has installed - on the opposite to the instance you are looking at where the App is (most probably) not there (because you are not seeing it I assume the App was never introduced there, you would need to purchase it from Marketplace if you found it useful in the past and want to have it on your instance, also).
@Bhavin shah It sounds like you will need to create a multi-user picker field (you may have to click on 'All' when creating a new field as only the single-user picker field type field is displayed in the default 'Standard' tab.
Users could then populate this field with their name as a mark that they have signed off, or if this field was automatically set (e.g. to the team's 4 managers) then you could create some workflow conditions which only allows a user in this field to transition the task to a certain status.
Hope this helps!
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