About Creating Layouts
A factory layout is an Inventor assembly file that contains extra data used by the Factory Design Utilities add-in. There are two factory layout templates; one uses metric (mm) units and the other uses imperial (in) units. Depending on which units you select during installation, one of them is copied to the default template folder and renamed StandardFactoryLayout.iam.
Clicking New Layout on the Factory tab, looks for and uses the StandardFactoryLayout.iam template file. If you click New on the Quick Access toolbar, the New File dialog displays the Inventor template files. Click the Factory folder to see the Factory Layout (in).iam and Factory layout (mm).iam template files.
To create a factory layout with different units, you can access the template from the New File dialog. If you want to change an existing file, you can specify the units using Document Settings on the Inventor Tools tab.