diff --git a/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResource.Serialization.cs b/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResource.Serialization.cs
new file mode 100644
index 0000000000000..764903ec81717
--- /dev/null
+++ b/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResource.Serialization.cs
@@ -0,0 +1,54 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using System.Text.Json;
+using Azure.Core;
+
+namespace Azure.ResourceManager.Core
+{
+    /// <summary>
+    /// A class representing a sub-resource that contains only the ID.
+    /// </summary>
+    public partial class SubResource : IUtf8JsonSerializable
+    {
+        /// <summary>
+        /// Serialize the input SubResource object.
+        /// </summary>
+        /// <param name="writer"> Input Json writer. </param>
+        void IUtf8JsonSerializable.Write(Utf8JsonWriter writer)
+        {
+            if (writer is null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            writer.WriteStartObject();
+            if (Optional.IsDefined(Id))
+            {
+                writer.WritePropertyName("id");
+                writer.WriteStringValue(Id);
+            }
+            writer.WriteEndObject();
+        }
+
+        /// <summary>
+        /// Deserialize the input JSON element to a SubResource object.
+        /// </summary>
+        /// <param name="element">The JSON element to be deserialized.</param>
+        /// <returns>Deserialized SubResource object.</returns>
+        internal static SubResource DeserializeSubResource(JsonElement element)
+        {
+            Optional<string> id = default;
+            foreach (var property in element.EnumerateObject())
+            {
+                if (property.NameEquals("id"))
+                {
+                    id = property.Value.GetString();
+                    continue;
+                }
+            }
+            return new SubResource(id.Value);
+        }
+    }
+}
diff --git a/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResource.cs b/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResource.cs
index f0f92ae6dafaa..84673404628ff 100644
--- a/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResource.cs
+++ b/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResource.cs
@@ -7,8 +7,15 @@ namespace Azure.ResourceManager.Core
     /// A class representing a sub-resource that contains only the ID.
     /// </summary>
     [ReferenceType]
-    public abstract class SubResource
+    public partial class SubResource
     {
+        /// <summary> Initializes a new instance of SubResource. </summary>
+        /// <param name="id"> ARM resource Id. </param>
+        internal SubResource(string id)
+        {
+            Id = id;
+        }
+
         /// <summary>
         /// ARM resource identifier.
         /// </summary>
@@ -16,3 +23,6 @@ public abstract class SubResource
         public virtual ResourceIdentifier Id { get; set; }
     }
 }
+
+// Todo: we want to make the default one (SubResource) to represent read-only data,
+// that is the pattern we used in Resource and TrackedResource
diff --git a/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResourceReadOnly.Serialization.cs b/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResourceReadOnly.Serialization.cs
new file mode 100644
index 0000000000000..73da313642c81
--- /dev/null
+++ b/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResourceReadOnly.Serialization.cs
@@ -0,0 +1,49 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using System.Text.Json;
+using Azure.Core;
+
+namespace Azure.ResourceManager.Core
+{
+    /// <summary>
+    /// A class representing a sub-resource that contains only the ID.
+    /// </summary>
+    public partial class SubResourceReadOnly : IUtf8JsonSerializable
+    {
+        /// <summary>
+        /// Serialize the input SubResourceReadOnly object.
+        /// </summary>
+        /// <param name="writer"> Input Json writer. </param>
+        void IUtf8JsonSerializable.Write(Utf8JsonWriter writer)
+        {
+            if (writer is null)
+            {
+                throw new ArgumentNullException(nameof(writer));
+            }
+
+            writer.WriteStartObject();
+            writer.WriteEndObject();
+        }
+
+        /// <summary>
+        /// Deserialize the input JSON element to a SubResourceReadOnly object.
+        /// </summary>
+        /// <param name="element">The JSON element to be deserialized.</param>
+        /// <returns>Deserialized SubResourceReadOnly object.</returns>
+        internal static SubResourceReadOnly DeserializeSubResourceReadOnly(JsonElement element)
+        {
+            Optional<string> id = default;
+            foreach (var property in element.EnumerateObject())
+            {
+                if (property.NameEquals("id"))
+                {
+                    id = property.Value.GetString();
+                    continue;
+                }
+            }
+            return new SubResourceReadOnly(id.Value);
+        }
+    }
+}
diff --git a/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResourceReadOnly.cs b/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResourceReadOnly.cs
index cc99e43fe6d49..1f94564c78d88 100644
--- a/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResourceReadOnly.cs
+++ b/sdk/resourcemanager/Azure.ResourceManager.Core/src/Resources/SubResourceReadOnly.cs
@@ -7,12 +7,19 @@ namespace Azure.ResourceManager.Core
     /// A class representing a sub-resource that contains only the read-only ID.
     /// </summary>
     [ReferenceType]
-    public abstract class SubResourceReadOnly
+    public partial class SubResourceReadOnly
     {
+        /// <summary> Initializes a new instance of SubResourceReadOnly. </summary>
+        /// <param name="id"> ARM resource Id. </param>
+        internal SubResourceReadOnly(string id)
+        {
+            Id = id;
+        }
+
         /// <summary>
         /// ARM resource identifier (read-only).
         /// </summary>
         /// <value></value>
-        public virtual ResourceIdentifier Id { get; }
+        public virtual ResourceIdentifier Id { get; protected set; }
     }
 }