How do I transition from breast milk to formula?is there a specific way

Hi everyone. My son is 4 months and I’ve been giving him breast milk since he was born however through a bottle because he was having a hard time latching. I have been pumping every two hours every day to give him his milk on demand. It’s getting really hard now that he’s getting bigger and needs more than 3-4oz. My pumping only provided that much so I wanna slowly wien him into trying formula. Ive also tried drinking moringa, tried the lactation cookies from Walmart, drank mothers milk tea and chamomile tea and it’s always just up and down with me. Is there a way to go about doing this?