Ni zenmeyang（你怎么样？） means how are your condition? ( Refer to something) Ni hao (你好。）means daily greeting. Ok? Can understand?

Nǐ zěnme yàng means how are you or what' up ni hao means hello

Nǐ zěnme yàng Is indicative of the body condition,but Nǐ hǎo is the same to hello。

Nǐ zěnme yàng is a western invention traditionally Chinese people greet each other with Nǐ hǎo

Nǐ zěnme yàng - 你怎么样 - how's going? Nǐ hǎo - 你好- hi. hello. nice to see you, etc