Look also at Repeating Data Using Document Property Content Controls and Other Mapped Content Controls.

Templates/documents with mapped Content Controls will work on any computer running Office 2007 or later including Macs but not the online version or mobile versions.

The Add-In Graham suggested needs to be on the computer creating the template but not needed on computers using it. I have used the Add-In and think it is super. However, using repurposed Document Property Controls, as described in the link may meet your needs. There are other ways to create mapped content controls as well without adding any software or add-ins. However, those methods require a level of technical expertise most of us do not have, as well as a fair amount of time.