You can now add and edit monetary units, and basic editing of other unit types.

src/ifcopenshell-python/ifcopenshell/api/unit/add_monetary_unit.py

@@ -0,0 +1,9 @@
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"currency": "DOLLARYDOO"}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        return self.file.create_entity("IfcMonetaryUnit", self.settings["currency"])