Index: Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/SectionResultRows/MacroStabilityOutwardsSectionResultRow.cs
===================================================================
diff -u -r7d14097d7c501d82bb46724e3dc92872771f036e -r874ea87b2507771b5618b14ecf64dedd84b2418d
--- Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/SectionResultRows/MacroStabilityOutwardsSectionResultRow.cs	(.../MacroStabilityOutwardsSectionResultRow.cs)	(revision 7d14097d7c501d82bb46724e3dc92872771f036e)
+++ Ringtoets/Integration/src/Ringtoets.Integration.Forms/Views/SectionResultRows/MacroStabilityOutwardsSectionResultRow.cs	(.../MacroStabilityOutwardsSectionResultRow.cs)	(revision 874ea87b2507771b5618b14ecf64dedd84b2418d)
@@ -213,5 +213,37 @@
                     assessmentSection).Group;
             }
         }
+
+        /// <summary>
+        /// Gets or sets the indicator whether the combined assembly should be overwritten by <see cref="ManualAssemblyCategoryGroup"/>.
+        /// </summary>
+        public bool UseManualAssemblyCategoryGroup
+        {
+            get
+            {
+                return SectionResult.UseManualAssemblyCategoryGroup;
+            }
+            set
+            {
+                SectionResult.UseManualAssemblyCategoryGroup = value;
+                SectionResult.NotifyObservers();
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the manually selected assembly category group.
+        /// </summary>
+        public FailureMechanismSectionAssemblyCategoryGroup ManualAssemblyCategoryGroup
+        {
+            get
+            {
+                return SectionResult.ManualAssemblyCategoryGroup;
+            }
+            set
+            {
+                SectionResult.ManualAssemblyCategoryGroup = value;
+                SectionResult.NotifyObservers();
+            }
+        }
     }
 }
\ No newline at end of file
Index: Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Views/SectionResultRows/MacroStabilityOutwardsSectionResultRowTest.cs
===================================================================
diff -u -r7d14097d7c501d82bb46724e3dc92872771f036e -r874ea87b2507771b5618b14ecf64dedd84b2418d
--- Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Views/SectionResultRows/MacroStabilityOutwardsSectionResultRowTest.cs	(.../MacroStabilityOutwardsSectionResultRowTest.cs)	(revision 7d14097d7c501d82bb46724e3dc92872771f036e)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Views/SectionResultRows/MacroStabilityOutwardsSectionResultRowTest.cs	(.../MacroStabilityOutwardsSectionResultRowTest.cs)	(revision 874ea87b2507771b5618b14ecf64dedd84b2418d)
@@ -100,6 +100,8 @@
             Assert.AreEqual(result.DetailedAssessmentProbability, row.DetailedAssessmentProbability);
             Assert.AreEqual(result.TailorMadeAssessmentResult, row.TailorMadeAssessmentResult);
             Assert.AreEqual(result.TailorMadeAssessmentProbability, row.TailorMadeAssessmentProbability);
+            Assert.AreEqual(result.UseManualAssemblyCategoryGroup, row.UseManualAssemblyCategoryGroup);
+            Assert.AreEqual(result.ManualAssemblyCategoryGroup, row.ManualAssemblyCategoryGroup);
 
             TestHelper.AssertTypeConverter<MacroStabilityOutwardsSectionResultRow,
                 NoProbabilityValueDoubleConverter>(
@@ -109,6 +111,60 @@
                 nameof(MacroStabilityOutwardsSectionResultRow.TailorMadeAssessmentProbability));
         }
 
+        [Test]
+        public void UseManualAssemblyCategoryGroup_SetNewValue_NotifyObserversAndPropertyChanged()
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            var observer = mocks.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mocks.ReplayAll();
+
+            FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
+            var result = new MacroStabilityOutwardsFailureMechanismSectionResult(section);
+            result.Attach(observer);
+
+            var row = new MacroStabilityOutwardsSectionResultRow(result, new MacroStabilityOutwardsFailureMechanism(), assessmentSection);
+
+            // Precondition
+            Assert.IsFalse(result.UseManualAssemblyCategoryGroup);
+
+            // Call
+            row.UseManualAssemblyCategoryGroup = true;
+
+            // Assert
+            Assert.IsTrue(result.UseManualAssemblyCategoryGroup);
+            mocks.VerifyAll();
+        }
+
+        [Test]
+        public void ManualAssemblyCategoryGroup_SetNewValue_NotifyObserversAndPropertyChanged()
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var assessmentSection = mocks.Stub<IAssessmentSection>();
+            var observer = mocks.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mocks.ReplayAll();
+
+            var random = new Random(39);
+            var newValue = random.NextEnumValue<FailureMechanismSectionAssemblyCategoryGroup>();
+
+            FailureMechanismSection section = FailureMechanismSectionTestFactory.CreateFailureMechanismSection();
+            var result = new MacroStabilityOutwardsFailureMechanismSectionResult(section);
+            result.Attach(observer);
+
+            var row = new MacroStabilityOutwardsSectionResultRow(result, new MacroStabilityOutwardsFailureMechanism(), assessmentSection);
+
+            // Call
+            row.ManualAssemblyCategoryGroup = newValue;
+
+            // Assert
+            Assert.AreEqual(newValue, result.ManualAssemblyCategoryGroup);
+            mocks.VerifyAll();
+        }
+
         #region Registration
 
         [Test]
@@ -516,7 +572,7 @@
             // Setup
             var failureMechanism = new MacroStabilityOutwardsFailureMechanism();
 
-            var mocks = new MockRepository();            
+            var mocks = new MockRepository();
             IAssessmentSection assessmentSection = AssessmentSectionHelper.CreateAssessmentSectionStub(failureMechanism, mocks);
             mocks.ReplayAll();