In the answer to question no. (45757), we have stated that it is permissible for seven people to share in a camel or a cow, but it is not permissible to share a sheep.
It is permissible to share in a cow or a camel even if some of the participants do not have the intention of offering a sacrifice, and simply want the meat to eat it, sell it or whatever.
Al-Nawawi said in al-Majmoo’, 8/372:
It is permissible to have a share of one-seventh of a camel or a cow for sacrifice, whether all the people are members of the same household or not, or whether some of them just want the meat; that is sufficient on the part of the one who is offering the sacrifice, whether the sacrifice is in fulfilment of a vow or is offered voluntarily. This is our view and it is the view of Ahmad and most of the scholars. End quote.
Ibn Qudaamah said in al-Mughni (13/363):
A camel is sufficient on behalf of seven people, as is a cow. This is the view of the majority of scholars… then he quoted some ahaadeeth which indicate that, then he said:
Having established that, it makes no difference whether the partners are members of one household or not, whether they are offering an obligatory or voluntary sacrifice, or whether some of them have the intention of offering a sacrifice whilst others simply want the meat, because the share of each of them is sufficient for him and the intention of the others does not matter. End quote.