diff --git a/yaml/office-walls.yaml b/yaml/office-walls.yaml
new file mode 100644
index 0000000..df1efec
--- /dev/null
+++ b/yaml/office-walls.yaml
@@ -0,0 +1,12 @@
+src: ifc/office.ifc
+
+operations:
+  - name: Extract walls
+    command: extract
+    input: ifc/office.ifc
+    output: ifc/office_walls.ifc
+    types:
+      - IfcWall
+      - IfcWallStandardCase
+
+dest: ifc/office_walls.ifc