Leave blank, N/A, or None?

[vibgyor1111 2]

After reading http://www.visajourney.com/wiki/index.php?title=NVC_Process , I'm wondering about the question mentioned in thread title. He states to answer all questions, but the sample docs( http://www.visajourney.com/examples/INS-Form-I-864.pdf) I see leave the majority of questions unanswered. I don't even see a case where the example situations given in the instructions apply. For example, would I need to put N/A or none for postal code for my current address because Ho Chi Minh City doesn't use one. Other examples include things like A-number or USCIS online account number,.  Would I write in none? If I'm only sponsoring the intending immigrant, do I put N/A for Family member  1, 2  employer 2 etc,  Part 7-use of assets, If i'm not using assets will I write in N/A.  TIA

[pushbrk 12,115]

Understand the difference between not applicable and none.  It is perfectly OK to leave a postal code blank when there is none.  The instructions you are reading are a carryover from old forms.  You can't even enter N/A in the new forms.  If family member number 1 is NONE, then leave everything else blank about ANY other family members.  Follow that logic all the way through.