Is it permissible to work as a regional manager for a global company whose regulations conform to Islamic Sharia, except that it does not prohibit alcoholic beverages at external events, knowing that accepting the job requires approving the invoices for these beverages?

It is permissible to work for the company if the work is restricted to permissible actions, without signing or approving invoices for prohibited things like alcohol and unlawful parties. However, if the job requires that, then it is not permissible, due to the cooperation in sin involved, and one's job position does not justify committing forbidden acts.