You can now add / remove cost schedules

src/ifcopenshell-python/ifcopenshell/api/cost/add_cost_schedule.py

@@ -0,0 +1,22 @@
+import ifcopenshell.api
+import ifcopenshell.util.date
+from datetime import datetime
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"name": None, "predefined_type": "NOTDEFINED", "start_time": datetime.now()}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        cost_schedule = ifcopenshell.api.run(
+            "root.create_entity",
+            self.file,
+            ifc_class="IfcCostSchedule",
+            predefined_type=self.settings["predefined_type"],
+            name=self.settings["name"],
+        )
+        cost_schedule.UpdateDate = ifcopenshell.util.date.datetime2ifc(datetime.now(), "IfcDateTime")
+        return cost_schedule