1, the legal meaning of secondment is vague and not strict. The core of the labor contract law is the labor remuneration, rest and vacation, social insurance and other rights and interests of workers. You have the right to refuse secondment because of the change of work place.
2. If there is an agreement in the labor contract between you and the group that the group has the right to arrange your transfer in the same city without reducing the treatment, then you have no right to refuse the transfer.