What is the maximum RAM capacity of Lenovo Yoga 460 laptop. It shows 8 GB RAM WITH ONE SLOT EMPTY?

CAN I USE 2 16 GB RAM TO GET 32 GB RAM IN MY LENOVO YOGA 460?

Max memory 8gb. Looks like you are already maxxed out. Surprised a bit though so perhaps you should check the lenovo site for your country as you didn't say which country you purchased it.

See maker's website for your particular model under specifications