If a father separated money for his Chatas prior to his death the son may not use that money for his own Chatas.
If someone committed a sin and he set aside an animal for his Chatas he may not bring the Korban for a different sin.
If someone committed a sin and he set aside money for his Chatas he may not use the money to buy a Korban for a different sin.
If a Nazir set aside animals Ba'alei Mumim for his Korbanos before he died if the son took on Nezirus on condition to use his deceased father's Korbanos he may use them for his Korbanos. (1)
The Tana Kama says that if the blood of the Korbanos of a Nezirah was already sprinkled on the Mizbe'ach the husband may no longer annul her Nezirus. (2)
R. Akiva holds that as soon as the Korban Chatas is Shechted even though the blood was not yet sprinkled, the Nezirus may no longer be annulled. (3)
According to R. Meir he may annul the Neder even after the blood was sprinkled because she still has to shave her hair. (4)
According to R. Eliezer he may annul the Neder even after the blood was sprinkled because she may not drink wine until she shaves her hair. (5)
Even if the blood of the Korbanos Tum'ah of a Nezirah was already sprinkled on the Mizbe'ach the husband may annul her Nezirus. (6)
If the Kivsei Atzeres are Shechted she'Lo Lishmah or prior to or after Shavuos the blood may be sprinkled and the flesh may be eaten.
If it is Shabbos the blood may not be sprinkled but if it is sprinkled the Korban is Kosher and the Eimurim shall be brought on the Mizbe'ach on Motza'ei Shabbos.
A father may make his son into a Nazir but not the mother.
If the son or the relatives protest or they cut the son's hair the son is not a Nazir.
If the son or the relatives protest and animals had already been specified for the Korbanos, the Chatas is put to death and Olah and Shelamim are brought on the Mizbe'ach. (7)
If Ma'os Stumim were set aside for the Korbanos, if the relatives protest the money shall be used for Olos Nedavah.
If Ma'os Mefurashos were set aside, the money for the Chatas shall be thrown into the Dead Sea and the money for the Olah and Shelamim shall be used for an Olah and Shelamim.
A BIT MORE
1. He may sell the animals and use the proceeds for his Korbanos.
2. Because once the blood of one of the Korbanos is sprinkled on the Mizbe'ach she is no longer forbidden to drink wine and therefore it is no longer classified as a Neder of Inuy Nefesh and a husband may only annul Nedarim that are Inuy Nefesh.
3. The reason is that if the Neder is annulled it will cause Hefsed Kodshim because the Chatas will be Pasul since a Chatas that is brought she'Lo Lishmah is Pasul.
4. Although she may drink wine, she must shave her hair and she will not look good for her husband and therefore it is still a Neder of Inuy Nefesh. Even though it is possible for her to wear a wig, R. Meir holds that a wig from another woman's hair is disgusting to her husband.
5. R. Eliezer holds that a Nezirah is forbidden to drink wine until she shaves her hair and therefore it is still a Neder of Inuy Nefesh.
6. Because after the Korbanos Tum'ah are brought she has to recount the Nezirus and therefore it is still a Neder of Inuy Nefesh.
7. The Shelamim is eaten for one day and does not require bread to be brought with it.
If the Kivsei Atzeres are Shechted on Shabbos she'Lo Lishmah the blood may not be sprinkled. Why may the blood not be sprinkled on Shabbos? The Rosh answers that the Rabanan prohibited it because it is a Tikun Zevach; it allows the Eimurim to be brought and the flesh to be eaten. It is a similar prohibition to the Isur of separating Terumah and Ma'aser on Shabbos.
SHECHITAH SHE'LO LISHMAH
If the two Kivsei Atzeres are Shechted she'Lo Lishmah or they were Shechted prior to or after Shavuos the blood may be sprinkled and the flesh may be eaten even though the Tzibur is not Yotzei their Chov with them. If it is Shabbos the blood may not be sprinkled but if it is sprinkled the Korban is Kosher and the Eimurim shall be brought on the Mizbe'ach on Motza'ei Shabbos. (Rambam Hilchos Pesulei ha'Mukdashim 15:19)