Is it a good practice to submit L1A extension (normal processing) and subsequently file GC under EB-1C within a week or two?

There is nothing wrong with the way that your company intends to process your case. The L-1 visa is one that is dual intent – that is, a beneficiary can have both the intent to immigrate and the intent to stay in the U. S. on nonimmigrant visa only. The order of whether to file the EB-1C petition at this time or later should not matter. The adjudication of the EB-1C category case will usually take longer than the processing of an L-1 extension anyway. Generally speaking, trouble with the EB-1C I-140 petition does not have much impact upon an L-1 extension in our experience. However, if you are concerned, you can ask your company to file the L-1 extension through premium processing and wait until it is approved before filing the EB-1C case. . 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 a 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.