In addition to the suggestions Graham made, I want to draw your attention to one of the solutions given in Greg Maxey's page on repeating data: Document Property Content Controls. This is a relatively easy way to repeat a few (< 16) items of information throughout a document. A change made in any of the controls, changes it in all of the linked controls.

Repeating Data Using Document Property Content Controls and Other Mapped Content Controls

This is a special case of using mapped content controls. They come already mapped.