Ask HN: What business course is recommended to manage a multi-million $ company?

This is for someone who is very experienced and technically proficient, and with hard-work and enterprise has worked all the way to the top. The person was asked last year to manage and grow the whole multi-million dollar fashion retail vertical and has been given a free hand on everything (except finance that the parent company wants an MBA to handle). The person now feels a bit lost and overwhelmed in the world of Excel, reports and charts and feels their performance is not upto par because of the high learning curve in keeping up with corporate jargons.