How to wean baby off BM and switch to FM?

Hi. I just managed to try let baby used to fm as she has been fully BM. So now she's on half feed as my supply drop. I have tried several brands but still take friso (same as my 7 year old girl who takes since baby) Slowly introduce one bottle daily. Or if u don't mind like me I mix the two together initially for her to get used to the taste. Then slowly she will adapt and take fm.