Can i file an interlocutory application to set aside a sale in a writ petition

It is confusing when you say you filed a writ in high court to prayer to allow the MA.  Also the facts stated by you do not provide sufficient clarity on actual developments. 

However, broadly you can file IA in pending writ petition in respect of any subsequent development in the proceedings under challenge.  Some judges take a view that IA is not tenable and rather an amendment should be moved.

About you seeking to challenge another order of DRT in a connected matter, the same may not be tenable either in IA in original petition or through amendment.  As such order will provide a separate substantive cause of action, separate writ petition will be required ideally.

Regret that I am unable to answer precisely for want of clear narration of facts.