diff --git a/yaml/merge_columns.yaml b/yaml/merge_columns.yaml
new file mode 100644
index 0000000..3f687cb
--- /dev/null
+++ b/yaml/merge_columns.yaml
@@ -0,0 +1,18 @@
+src: ifc/office_level_0.ifc
+
+operations:
+  - name: Three-way merge of office_level_0 and office_level_columns
+    command: merge-ifc
+    base: ifc/office_level_0.ifc
+    local: ifc/office_level_0.ifc
+    remote: ifc/office_level_columns.ifc
+    output: ifc/office_level_merged.ifc
+
+  - name: Show diff between source and merged result
+    command: diff
+    input: ifc/office_level_0.ifc
+    target: ifc/office_level_merged.ifc
+    output: office_level_merged.diff
+    verbose: true
+
+dest: ifc/office_level_merged.ifc