This article is part of the In Microsoft Dynamics 365 Business Central (Administration), how do I… series and of the wider In Microsoft Dynamics 365 Business Central, how do I… series which I am posting as I familiarise myself with Microsoft Dynamics 365 Business Central.
As well as creating a Word template from the Word Templates page, you can also start from a master page (or related list page); starting this way will add the master record type as the source.
To create a Word template in this way, open the master record page and click Actions » Apply Word template: