How to prepare a Lift of Stay for federal court

I filed a Civil Suit as Pro-Se aganist 2- Defendants in District Court 2 1/2 yrs. ago. Last week I filed a partial summay judgment on one of the Defendants, the other one was just a witness that I really did need. The court wrote me back and said the Defendant G.M.A.C that I didn't need and didn't owe me any money filed Bankrutpcy. So my partial summay judgment will not be heard becasue of the Bankruptcy. How can I get a lift of stay for G.M.A.C and drop them from this suit? Need case laws on how to draw it up in Federal Court. I really don't need GMAC at all they were named as Defendant just as a witness only.