See #5972. You can now remove boolean operations in the stack without deleting operands.

src/bonsai/bonsai/bim/module/model/__init__.py

@@ -88,6 +88,7 @@ classes = (
     opening.HideOpenings,
     opening.PurgeUnusedOpenings,
     opening.RecalculateFill,
+    opening.RemoveBoolean,
     opening.RemoveBooleans,
     opening.ShowBooleans,
     opening.ShowOpenings,

src/bonsai/bonsai/bim/module/model/opening.py

@@ -1144,6 +1144,27 @@ class PurgeUnusedOpenings(Operator, tool.Ifc.Operator):
         return {"FINISHED"}
 
 
+class RemoveBoolean(Operator, tool.Ifc.Operator):
+    bl_idname = "bim.remove_boolean"
+    bl_label = "Remove Boolean"
+    bl_options = {"REGISTER", "UNDO"}
+    bl_description = "Removes the actively selected boolean"
+
+    @classmethod
+    def poll(cls, context):
+        props = context.scene.BIMBooleanProperties
+        return props.active_boolean
+
+    def _execute(self, context):
+        props = context.scene.BIMBooleanProperties
+        ifcopenshell.api.geometry.remove_boolean(
+            tool.Ifc.get(), tool.Ifc.get().by_id(props.active_boolean.ifc_definition_id)
+        )
+        bpy.ops.bim.enable_editing_booleans()
+        rep_obj = bpy.context.scene.BIMGeometryProperties.representation_obj
+        tool.Geometry.reload_representation(rep_obj)
+
+
 # TODO: merge with ProfileDecorator?
 class DecorationsHandler:
     installed = None

src/bonsai/bonsai/bim/module/void/prop.py

@@ -45,3 +45,8 @@ class BIMBooleanProperties(PropertyGroup):
         name="Operator",
         default="DIFFERENCE",
     )
+
+    @property
+    def active_boolean(self):
+        if self.booleans and self.active_boolean_index < len(self.booleans):
+            return self.booleans[self.active_boolean_index]

src/bonsai/bonsai/bim/module/void/ui.py

@@ -176,6 +176,10 @@ class BIM_PT_booleans(Panel):
         row.prop(props, "operator", text="")
         row.operator("bim.add_boolean", text="", icon="ADD")
 
+        row = layout.row(align=True)
+        row.alignment = "RIGHT"
+        row.operator("bim.remove_boolean", text="", icon="X")
+
         self.layout.template_list("BIM_UL_booleans", "", props, "booleans", props, "active_boolean_index")