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The Window tool can be used to insert windows into walls, but you need to first define window styles.

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Before creating any windows, you must have at least one wall defined. See Inserting Walls. To assign height to a wall, define a Thickness in the 3D page of the wall's Properties.
This is the icon for Window. Right-click on the icon to set the tool's Properties, and click the icon when you're ready to insert a window.
Open the Window tool's Properties. On the General page, select the Window Style.
On the Window Main page, set the overall dimension of the window. The preview at the lower left updates when you change the values. Width and Height: Overall outer dimensions of the window. Inside/Outside of Frame: Specifies that the dimensions of the window are applied by measuring to the inside or outside of the window frame. Vertical alignment: Specifies whether the widows vertical position is specified by the Sill Height, or the Head of the window. Head Height: Specifies the vertical location of the top of the window. This field is only accessible if the vertical alignment option is set to Head of object. Sill Height: Specifies the vertical location of the sill of the window. This field is only accessible if the vertical alignment option is set to Sill of object. Rise: The distance from the top corner to the top center, in the case of arched or peaked windows. Frame Inset: The distance from the front of the wall to the window frame. Open Percent: Defines how wide the window is open. Leaf: in the case of uneven windows, the size of one of the panes.
On the Pen page, specify the color of the window. This color will be applied to any part of the window that does not have a material assignment.
When all parameters are set, activate Window and click the wall to place the windows. The wall material within the window area is removed. No matter where you click on the wall, the windows are placed according to the Elevation value. In this example, the sash is colored black, which is the default Pen color. The frame and glass have the assigned materials.
If you click another wall, the window properly aligns to it.
You can orient of the window to the wall by using the Flip Left-Right, Flip Inside-Outside controls in the Local menu, or Inspector bar.