You can assign the glazing system material as a construction layer similar to any other construction. Follow these steps:

• Define a new Simple Glazing System Window Material by clicking on the + sign at the bottom and then input the window properties.

• Create a new construction object and then drag the defined simple glazing material in the previous step and drop it in the gray box as shown below.

• Drag the previously defined construction and drop it for the glazing units as shown below.

To use the WindowMaterial:SimpleGlazingSystem in IDF:

1. In WindowMaterial:SimpleGlazingSystem, you need to define glazing system properties including values for U-factor and Solar Heat Gain Coefficient, and optionally Visible Transmittance.
2. In Construction, you need to create a new construction and assign the object you defined in step 1 as a layer.
3. You should reference the construction you defined in step 2 as the construction material for your windows in the FenestrationSurface:Detailed or Window objects.

The following is an IDF example:

WindowMaterial:SimpleGlazingSystem,
    Glazing Layer,           !- Name
    2.0441736,               !- U-Factor {W/m2-K}
    0.38,                    !- Solar Heat Gain Coefficient
    0.418;                   !- Visible Transmittance

Construction,
    Window_U_0.36_SHGC_0.38, !- Name
    Glazing Layer;           !- Outside Layer

FenestrationSurface:Detailed,
    Perimeter_bot_ZN_1_Wall_South_Window1,  !- Name
    Window,                  !- Surface Type
    Window_U_0.36_SHGC_0.38, !- Construction Name
    Perimeter_bot_ZN_1_Wall_South,  !- Building Surface Name
    ,                        !- Outside Boundary Condition Object
    AutoCalculate,           !- View Factor to Ground
    ,                        !- Frame and Divider Name
    1.0000,                  !- Multiplier
    4,                       !- Number of Vertices
    0.000000000000,          !- Vertex 1 X-coordinate {m}
    0.000000000000,          !- Vertex 1 Y-coordinate {m}
    2.329300000000,          !- Vertex 1 Z-coordinate {m}
    0.0000,                  !- Vertex 2 X-coordinate {m}
    0.0000,                  !- Vertex 2 Y-coordinate {m}
    0.95455007488,           !- Vertex 2 Z-coordinate {m}
    15.8242,                 !- Vertex 3 X-coordinate {m}
    0.0000,                  !- Vertex 3 Y-coordinate {m}
    0.95455007488,           !- Vertex 3 Z-coordinate {m}
    15.824200000000,         !- Vertex 4 X-coordinate {m}
    0.000000000000,          !- Vertex 4 Y-coordinate {m}
    2.329300000000;          !- Vertex 4 Z-coordinate {m}