For getting DD to take the milk during the day I started with the afternoon feed as for this BF she only fed for 5-10 mins anyway. I didn't offer a bottle as I don't really want to get her started on bottles now, so used a doidy cup instead, half full of slightly warmed milk. As I said, she didn't take much, so I made sure to offer lots of water all day too. She took a few days to get the hang of this, but didn't miss the BF at all. Have offered grapes/biscuits too at the same time. After a week or so of this I changed the mid morning feed over as well, same process, and it was fine.
I have noticed that with dropping the am and pm BF and replacing with cows milk, she is eating more at lunchtime and supper now, and drinking more water then too. I did bring supper forward 40 minutes or so too, as she seemed hungrier earlier. I've made more of an effort to include milk at these meals - cereals and cheese sauces etc. Also, she isn't making up for the missing BF at the other feeds, so she is obviously happy with the new arrangements.
Haven't yet thought of how to change the remaining 2 feeds over!