Index: DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Factories/FactoryForSoilProfiles.cs
===================================================================
diff -u -r4879 -r4903
--- DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Factories/FactoryForSoilProfiles.cs	(.../FactoryForSoilProfiles.cs)	(revision 4879)
+++ DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Factories/FactoryForSoilProfiles.cs	(.../FactoryForSoilProfiles.cs)	(revision 4903)
@@ -28,7 +28,7 @@
 
 namespace Deltares.DamEngine.TestHelpers.Factories;
 
-public class FactoryForSoilProfiles
+public static class FactoryForSoilProfiles
 {
     /// <summary>
     /// Create simple soil profile
Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2DSurfaceLineHelper.cs
===================================================================
diff -u -r4898 -r4903
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2DSurfaceLineHelper.cs	(.../SoilProfile2DSurfaceLineHelper.cs)	(revision 4898)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geotechnics/SoilProfile2DSurfaceLineHelper.cs	(.../SoilProfile2DSurfaceLineHelper.cs)	(revision 4903)
@@ -56,4 +56,19 @@
 
         return true;
     }
+
+    /// <summary>
+    /// Combines the surface line with SoilProfile2D to create a new profile2D.
+    /// </summary>
+    /// <param name="surfaceLine">The surface line.</param>
+    /// <param name="soilProfile2D">The SoilProfile2D.</param>
+    /// <param name="defaultSoil">The default soil.</param>
+    /// <param name="shift">The required shift of the geometry so it will fit the surface line</param>
+    /// <returns></returns>
+    public static SoilProfile2D CombineSurfaceLineWithSoilProfile2D(SurfaceLine2 surfaceLine, SoilProfile2D soilProfile2D,
+                                                             Soil defaultSoil, double shift)
+    {
+        return null;
+    }
+    
 }
\ No newline at end of file
Index: DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs
===================================================================
diff -u -r4898 -r4903
--- DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs	(.../SoilProfile2DSurfaceLineHelperTests.cs)	(revision 4898)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data.Tests/Geotechnics/SoilProfile2DSurfaceLineHelperTests.cs	(.../SoilProfile2DSurfaceLineHelperTests.cs)	(revision 4903)
@@ -19,6 +19,7 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System.Collections.Generic;
 using System.Linq;
 using Deltares.DamEngine.Data.Geometry;
 using Deltares.DamEngine.Data.Geotechnics;
@@ -34,6 +35,57 @@
     // For debugging purposes
     private const string visualizationFolder = @"D:\src\dam\DamTools\GeometryVisualizer\";
 
+    private static IEnumerable<TestCaseData> SurfaceLinesTestCases
+    {
+        get
+        {
+            yield return new TestCaseData(
+                new TestCaseSurfaceLine
+                {
+                    SurfaceLine = FactoryForSoilProfiles.CreateSurfaceLine(new[]
+                    {
+                        new GeometryPoint(0, 0),
+                        new GeometryPoint(5, 10),
+                        new GeometryPoint(10, 10)
+                    }),
+                    SurfaceCount = 3
+                }).SetName("Surface is same as original surfaceline of soil profile");
+            yield return new TestCaseData(
+                new TestCaseSurfaceLine
+                {
+                    SurfaceLine = FactoryForSoilProfiles.CreateSurfaceLine(new[]
+                    {
+                        new GeometryPoint(0, 1),
+                        new GeometryPoint(5, 11),
+                        new GeometryPoint(10, 11)
+                    }),
+                    SurfaceCount = 3
+                }).SetName("Surface is completely above original surfaceline of soil profile");
+            yield return new TestCaseData(
+                new TestCaseSurfaceLine
+                {
+                    SurfaceLine = FactoryForSoilProfiles.CreateSurfaceLine(new[]
+                    {
+                        new GeometryPoint(0, -1),
+                        new GeometryPoint(5, 9),
+                        new GeometryPoint(10, 9)
+                    }),
+                    SurfaceCount = 3
+                }).SetName("Surface is completely below original surfaceline of soil profile");
+            yield return new TestCaseData(
+                new TestCaseSurfaceLine
+                {
+                    SurfaceLine = FactoryForSoilProfiles.CreateSurfaceLine(new[]
+                    {
+                        new GeometryPoint(0, 1),
+                        new GeometryPoint(5, 9),
+                        new GeometryPoint(10, 11)
+                    }),
+                    SurfaceCount = 3
+                }).SetName("Surface is partially above and below original surfaceline of soil profile");
+        }
+    }
+
     [Test]
     [TestCase(PositionToSoilProfile2D.LeftOfSoilProfile, false)]
     [TestCase(PositionToSoilProfile2D.RightOfSoilProfile, false)]
@@ -52,6 +104,34 @@
         Assert.That(SoilProfile2DSurfaceLineHelper.IsSurfaceLineInsideSoilProfile2D(surfaceLine, soilProfile2D), Is.EqualTo(result));
     }
 
+    [Test, TestCaseSource(nameof(SurfaceLinesTestCases))]
+    [Ignore("Work in progress")]
+    public void GivenSoilProfile2DWhenCombiningWithSurfaceLineThenCorrectNewSoilProfile2DIsCreated(TestCaseSurfaceLine testCaseSurfaceLine)
+    {
+        // Given
+        SoilProfile2D soilProfile2D = FactoryForSoilProfiles.CreateSoilProfile2DWithThreeLayers();
+        var defaultSoil = new Soil
+        {
+            Name = "dikemat"
+        };
+        SoilProfile2D newSoilProfile2D = SoilProfile2DSurfaceLineHelper.CombineSurfaceLineWithSoilProfile2D(
+            testCaseSurfaceLine.SurfaceLine, soilProfile2D, defaultSoil, 0);
+        Assert.That(newSoilProfile2D, Is.Not.Null);
+        Assert.That(newSoilProfile2D.Surfaces, Has.Count.EqualTo(testCaseSurfaceLine.SurfaceCount));
+    }
+
+    /// <summary>
+    /// Test case class for GivenSoilProfile2DWhenCombiningWithSurfaceLineThenCorrectNewSoilProfile2DIsCreated()
+    /// </summary>
+    public class TestCaseSurfaceLine
+    {
+        public SurfaceLine2 SurfaceLine { get; set; }
+        public int SurfaceCount { get; set; }
+    }
+
+    /// <summary>
+    /// To indicate the position of the surface line to the soil profile.
+    /// </summary>
     public enum PositionToSoilProfile2D
     {
         LeftOfSoilProfile,