The SAP Help says the following:
Source: SAP
This document covers the second part of the paragraph.
Figure 1
Figure 1 shows by going to Tools > Preferences > Application Design > Application Templates, you store the path to
the folder where these templates are stored
In this example, I also create a template category called "Custom Category"
Figure 2
Now to export the application, go to the menu as shown in Figure 2, select Application > Export as Template
Figure 3
Click Next to continue
Figure 4
Figure 4 shows you can add a custom icon for your template, along with a description. You also assign the template a category
Figure 5
To access new custom template select File > New and you can see the Custom Category created at the bottom of Figure 5, along with the icon