Staff Handbook Word Document

We have a Staff Handbook that we use for our clients. The document is 40 pages long. There are also about 20 imbedded work documents of generally 2 -6 pages. The project we are after is to automate the updating of client details, logos team titles etc as a macro across the document. We also want to add or delete sections based on client needs, this would work like a checkbox of the contents page. We envisage the data would be populated in say excel then merged to a base document. This is a job for a very experienced and compentent Word professional.