I recently received an immigrant visa to USA. Could anyone suggest me a legal way to take my money to USA. The amount is roughly 90 lakh NRS. If anyone have prior experience, please share. I deeply appreciate your help.  

Moving it to front.

Bringing that amont of money to US at one time may be a risky business. I believe there is a restriction on how much dollars you can exchange from rastra bank at one time. It would be lot better to divide it into couple of trips or share it among various family members or friends if they were traveling with you. Try finding people who are traveling to US and willing to help you out. You can also try to exchange your NRS to dollars by contacting businessman or people who returns from US. They may charge you little more than what rastra bank rate is.

 $10000 dollars ta legally nai launa milchha. More than that you will need to file Customs form 4790 for Internal Revenue Services for Tax purposes. Aba baki 2000000 chhain Hundi garnu parla or find some one who's coming to US and willing to carry that amount for you.

Try to do it legally because if you try to deposit that amount of cash in US bank, you may be flagged for F.BI investigation. I heard anything over 10000 in cash deposit will be looked into.

 That's around $125,000. 
I cannot even suggest to come to US putting all $125,000 inside ur underwear. A woman with $170,000 inside her panty (1699 of $100 each) was recently caught at New York airport and sent to jail. Freed at $100,000 bail, she could face 21 months in prison. 
So watva u do, do it legally.

Now, each time the bank give be 100 dollars notes, I wash my hand, u don' t know where that came from. 

Moving it to front.

you give money to dalal to Nepal, they arrange for your money here in Nepal.. simple as that..
but will cost you - Rs 7 for every dollar.

 sathi ji! where do you live. may be i can help you get your money to US

Thanks everyone for the response. I already know the hundi method and I have transferred some money via hundi. However, I am still trying to find a 'legal way' so I can show the source of funds if IRS or FBI looks into my bank account in the US. If anyone have prior experience taking money to the US with NRB's approval please share your experience.
Thanks again,

Legally... what a dumb ass,.. why do you even think then Hundi exists?

Under Nepalese constitution, it's ILLEGAL to even carry a $$ or any hard currencies (now don't ask me what is hard currencies).
Do you know why it's ILEEGAL.. it's whole another chapter I could write.
dumb, bumber...can't believe dummies  like you're coming to US to begin..

 Khambhu ji, 

 Moving it to front. 

Thats a big amount... dont go the illegal route.... just coz you may be flagged up.....

I was once questioned for depositing 7000 pounds ( I live in UK)....

find the legal way.... make sure you have a proper documentation of how you get that money..... you could be done for money laundering if you dont have proper source.....