rmxyz,

Originally, my friend wasn't planning to go to Nepal. So in that case, his company suggested him to apply the petition for his spouse. Also, please go to the following website that suggests to get the petition for the dependents:

http://nepal.usembassy.gov/temp_work_visa.html

It's best if you check with your company and make sure if it's needed or not. Please don't rely fully on my words as I am not an expert. I am just telling you what I know.