Slaam ula Kum,
I did ishtikara for the continuation of my marriage again I am sorry I have put different results in different posts if you can just answer one sorry as they must all point to one sign I dreamt again that I was with two woman my current wife and another woman, this has occurred to me 3-4 times. Sorry for my many posts please forgive me may Allah bless you all for your work.
Istikhara is not enough for what you are proposing to do. You need to consult with your shaykh and to discuss with your wife your wanting to take a second wife. It is a very delicate situation that needs openness and clarity, otherwise you are heading for disappointment and heartbreak.
Hajj Gibril Haddad