By default, every new project you start is based on a template. A template determines what settings new projects will have, such as the unit of measure, and building location settings. You can even include building elements in a template if you want.
You can create a template out of any drawing by simply saving it in your Templates directory. To use the template in new drawings you need to select the template in your Startup options.
To create a template:
Unless you have already created the drawing you want to use as a template, start a new project (File > New).
Specify the settings you want to save with the template, such as your building locations and program settings. Note that any elements in your drawing will be saved as well, so unless you want these elements to appear in new projects, you should delete the elements from your drawing.
Select File > Save As.
In the Save As dialog, navigate to the program’s Templates folder
(e.g. C:\Program Files\3D Home Architect\Design Suite Deluxe 8\Templates).
In the File name edit box, type a name for the template.
Click Save.