Inserts a subtractive box in the active Body. Its shape is subtracted from the existing solid.
On the left: active body (A) shown in grey and subtractive box (B) shown in transparent red; result on the right.
Usage
Press the Subtractive Box button. Note: the Subtractive Box is part of an icon menu labelled Create a subtractive primitive. After launching FreeCAD, the Subtractive Box is the one displayed in the toolbar. If a different primitive is displayed, click on the down arrow besides the icon and select Subtractive Box in the menu.
The Box can be edited after its creation in two ways:
Double-clicking it in the Model tree, or by right-clicking and selecting Edit primitive in the contextual menu; this brings up the Primitive parameters.