I am filing GC for my mother who is in US on visitor visa & her I-94 got extended for another 6 months. She never used her surname on her Indian passport? What should I mention in the last Name on I-130 & rest of the forms (I-485).Should I mention NA or not used or leave them blank?
You have several choices, including "No Last Name Used." If she wishes to use some other name, including adding a last name, now would be a good time to do it.