We switched to 3 bfs around 10 mos as well. I substituted a snack for the afternoon bf and then bf when she woke from her morning nap. She also started the 2 to 1 switch then, so that worked well in terms of coordinating bfs with odd naps. So, our 4 feed EASY was:
7:30 - wake and bf
8:30 - breakfast
11:00 - bf
11:30 -lunch
12:00 - nap
3ish - bf
4:30 - catnap
6 - dinner
7:30 - bf to bed
Then we dropped the 3 ish and gave her a snack when she woke from her am nap. Sometimes, she didn't want the bf at 11, so I'd do lunch, then 1/2 bf before the nap and the other 1/2 after the am nap. It was a bit crazy til naps all sorted out. Eventually, I replaced the mid morning with a snack around 1 year - she just wasn't interested any longer.
hth
michelle