1. Open the target Job Jackets file in a text editor.

2. Locate the <MasterPage> element for the desired master page and change its 'Default' attribute to 'Yes'. For example:

<MasterPage ID='MasterPage_1' Name='A-Master A' Status='Available' BottomMargin='' Columns='' Default='Yes' FacingPages='' GutterWidth='' IncludeGridAttributes='Yes' LeftMargin='' RightMargin='' TopMargin=''>

3. Use this Job Jackets file to construct the layout.