diff --git a/inventory_tools/hooks.py b/inventory_tools/hooks.py
index 924a675c..1bc6d05a 100644
--- a/inventory_tools/hooks.py
+++ b/inventory_tools/hooks.py
@@ -42,6 +42,7 @@
 
 # include js in doctype views
 doctype_js = {
+	"BOM": "public/js/custom/bom_custom.js",
 	"Item": "public/js/custom/item_custom.js",
 	"Job Card": "public/js/custom/job_card_custom.js",
 	"Operation": "public/js/custom/operation_custom.js",
@@ -125,6 +126,7 @@
 # Override standard doctype classes
 
 override_doctype_class = {
+	"BOM": "inventory_tools.inventory_tools.overrides.bom.InventoryToolsBOM",
 	"Delivery Note": "inventory_tools.inventory_tools.overrides.delivery_note.InventoryToolsDeliveryNote",
 	"Pick List": "inventory_tools.inventory_tools.overrides.pick_list.InventoryToolsPickList",
 	"Quality Inspection": "inventory_tools.inventory_tools.overrides.quality_inspection.InventoryToolsQualityInspection",
diff --git a/inventory_tools/inventory_tools/overrides/bom.py b/inventory_tools/inventory_tools/overrides/bom.py
new file mode 100644
index 00000000..3b642145
--- /dev/null
+++ b/inventory_tools/inventory_tools/overrides/bom.py
@@ -0,0 +1,77 @@
+# Copyright (c) 2025, AgriTheory and contributors
+# For license information, please see license.txt
+
+import frappe
+from erpnext.manufacturing.doctype.bom.bom import BOM
+from frappe.utils import flt, getdate, nowdate
+
+
+class InventoryToolsBOM(BOM):
+	@frappe.whitelist()
+	def update_cost(
+		self,
+		update_parent=True,
+		from_child_bom=False,
+		update_hour_rate=True,
+		save=True,
+		as_of_date=None,
+	):
+		self._as_of_date = getdate(as_of_date) if as_of_date else getdate(nowdate())
+		return super().update_cost(
+			update_parent=update_parent,
+			from_child_bom=from_child_bom,
+			update_hour_rate=update_hour_rate,
+			save=save,
+		)
+
+	def update_rate_and_time(self, row, update_hour_rate=False):
+		as_of_date = getattr(self, "_as_of_date", getdate(nowdate()))
+
+		if not row.hour_rate or update_hour_rate:
+			hour_rate = self._get_workstation_hour_rate(row.workstation, as_of_date)
+			if hour_rate is not None:
+				row.hour_rate = (
+					hour_rate / flt(self.conversion_rate) if self.conversion_rate and hour_rate else hour_rate
+				)
+			else:
+				cached_rate = flt(frappe.get_cached_value("Workstation", row.workstation, "hour_rate"))
+				if cached_rate:
+					row.hour_rate = (
+						cached_rate / flt(self.conversion_rate)
+						if self.conversion_rate and cached_rate
+						else cached_rate
+					)
+
+		if row.hour_rate and row.time_in_mins:
+			row.base_hour_rate = flt(row.hour_rate) * flt(self.conversion_rate)
+			row.operating_cost = flt(row.hour_rate) * flt(row.time_in_mins) / 60.0
+			row.base_operating_cost = flt(row.operating_cost) * flt(self.conversion_rate)
+			row.cost_per_unit = row.operating_cost / (row.batch_size or 1.0)
+			row.base_cost_per_unit = row.base_operating_cost / (row.batch_size or 1.0)
+
+		if update_hour_rate:
+			row.db_update()
+
+	def _get_workstation_hour_rate(self, workstation_name, as_of_date):
+		"""Sum costs from workstation_operating_cost table that cover the given date."""
+		rows = frappe.get_all(
+			"Workstation Operating Cost",
+			filters={"parent": workstation_name},
+			fields=["from_date", "to_date", "qty"],
+		)
+
+		if not rows:
+			return None
+
+		net_hour_rate = 0.0
+		has_match = False
+		for row in rows:
+			from_date = getdate(row.from_date) if row.from_date else None
+			to_date = getdate(row.to_date) if row.to_date else None
+
+			if from_date and from_date <= as_of_date:
+				if to_date is None or as_of_date <= to_date:
+					net_hour_rate += flt(row.qty)
+					has_match = True
+
+		return net_hour_rate if has_match else None
diff --git a/inventory_tools/public/js/custom/bom_custom.js b/inventory_tools/public/js/custom/bom_custom.js
new file mode 100644
index 00000000..285e1ad1
--- /dev/null
+++ b/inventory_tools/public/js/custom/bom_custom.js
@@ -0,0 +1,47 @@
+// Copyright (c) 2025, AgriTheory and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('BOM', {
+	refresh(frm) {
+		if (!frm.is_new() && frm.doc.docstatus < 2) {
+			frm.remove_custom_button(__('Update Cost'))
+			frm.add_custom_button(__('Update Cost'), function () {
+				let dialog = new frappe.ui.Dialog({
+					title: __('Update Cost'),
+					fields: [
+						{
+							fieldname: 'as_of_date',
+							fieldtype: 'Date',
+							label: __('As of Date'),
+							default: frappe.datetime.get_today(),
+							reqd: 1,
+							description: __(
+								'Operating costs from the Workstation Operating Cost table will be applied based on this date.'
+							),
+						},
+					],
+					primary_action_label: __('Update'),
+					primary_action(values) {
+						dialog.hide()
+						frappe.call({
+							doc: frm.doc,
+							method: 'update_cost',
+							freeze: true,
+							args: {
+								update_parent: true,
+								save: true,
+								from_child_bom: false,
+								as_of_date: values.as_of_date,
+							},
+							callback(r) {
+								refresh_field('items')
+								if (!r.exc) frm.refresh_fields()
+							},
+						})
+					},
+				})
+				dialog.show()
+			})
+		}
+	},
+})