What is procedure to withdraw form EOIR 29 appeal ??

Once you know that the appeal has reached the Board of Immigration Appeals, the petitioner can either write a letter or submit a motion to withdraw the appeal. There is no specific form for withdrawal. Due to the limitations of the lawyers.com forums, Alan Lee, Esq.’s (the firm) participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting the question. No attorney/client relationship is or shall be construed to be created hereby. The information provided herein by the firm is general and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice, nor as the basis for making any decisions of legal consequence.

Just write a letter to the court.