Retroactive Separation of Terumah / Other Tithes: Eruvin 36b-38a; Yuma 55b-56b; Succah 23b-24a; Bava Metzia 11a-b
Redeeming secondary tithe which is in a different location, on "the coin I will remove from my purse," so that the redemption will actually be retroactive: Eruvin 37b
Extending the boundary of Shabbat travel if the extension was established with a Bi-directional option: Yuma 56b; Eruvin 36b-38a
Setting up the meal which extends the limit for travel on Shabbat [Techum], and deciding afterward who will be the participants in the meal and for what time frame it will be used: Eruvin 37b
Deciding after Shabbat begins to use a meal extending the limit one may travel on Shabbat, if it was set up one's behalf before Shabbat began: Eruvin 82a
Considering an item purchased by partners to have parts of it owned by each individual partner, so that it will be as though they had each donated a part. The practical application would be to use this jointly-owned item for a symbol of the merger of adjacent properties, to permit transportation between them on Shabbat: Eruvin 71b
Deciding on Yom Tov that one will eat a chicken that had been purchased without specification as food or as egg-layer before Yom Tov began - and therefore the egg it lays on Yom Tov was considered food from the start of Yom Tov: Beitzah 4a
Designating a set of birds as those from which one will select his meal on Yom Tov, and then retroactively identifying the specific one on Yom Tov: Beitzah 10a-b
Retroactively nullifying impurity from affecting the entrances to a house that contains a corpse, by identifying which entrance will be used to remove the corpse: Eruvin 68a; Beitzah 10a
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