How to reply to an OA in CAT Chennai regarding transfer order

Received from an advocate notice in which i have been shown as respondent number 4 the issue is regarding posting transfer on rotational basis of one employee of our office posted from chennai to delhi the employee does not want to go citing parent children problems and has represented twice both the representations have been rejected by the HQ at delhi the employee has hired an advocate to submit OA in CAT chennai in which 4 respondents have been shown no court order has as yet been received for any hearing however the advocate has said that case has been filed and first hearing is fixed for 10 july 2017 in the meanwhile transfer orders have been sent to the house of the employee for moving on transfer to delhi wef 01 july 2017 since the employee is not attending office since 27 jun 2017 showing himself on EL and Medical leave till 10 jul 2017 questions do all respondents have to reply different counter affidavits who will be the deponent if one counter affidavit is filed?