The ElyaRabba writes that Al Pi Kabbala there one should bake 3 Challos
for Shabbos, each one larger than the other. The medium size challah
should be used for Friday night. The largest challah should be used
for Shabbos morning since the Halacha is that the morning meal should
be shown the most honor. The smallest one should be used for Seuda Shlishis.
The Mekor Chaim (written by the ChavosYair) says that you should bake a fourth challah. This should be in the shape of a Havdalah candle and should be used for Melava Malka. It is also used for Seuda Shlishis in order that you can make a bracha on LechemMishneh. (Minhag Yisroel Torah OC 242:1)
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