Implement feature for manipulating cost values, with support for calculation of subtotals

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

@@ -0,0 +1,9 @@
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"cost_value": None}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        self.file.remove(self.settings["cost_value"])