Hello Friend,
I am an expert Openccart developer, you can check my reviews for my experience. I can add another store to your current opencart store. Send me your opencart store URL to check.
I have few questions:-
1) Do you wanna change theme to the new store, or the same theme will be needed for the new store?
2) I would like to discuss regarding shipping, as if you required different shipping as per store we have to use different modules.
3) Payment method to the new store will be same as using on the existing store.
Looking forward for your response on our questions.
Kind Regards,
Pankaj Modi