diff --git a/src/xpk/parser/workload.py b/src/xpk/parser/workload.py
index 3ecb3d1a8..04de73f17 100644
--- a/src/xpk/parser/workload.py
+++ b/src/xpk/parser/workload.py
@@ -24,6 +24,7 @@
 from ..core.docker_image import DEFAULT_DOCKER_IMAGE, DEFAULT_SCRIPT_DIR
 from .common import add_shared_arguments
 from .validators import directory_path_type, name_type
+from ..utils.feature_flags import FeatureFlags
 
 
 def set_workload_parsers(workload_parser: ArgumentParser):
@@ -658,6 +659,13 @@ def add_shared_workload_create_optional_arguments(args_parsers):
             ' the workload.'
         ),
     )
+    if FeatureFlags.SUB_SLICING_ENABLED:
+      custom_parser.add_argument(
+          '--sub-slicing-topology',
+          type=str,
+          help='Sub-slicing topology to use.',
+          required=False,
+      )
 
 
 def add_shared_workload_create_env_arguments(args_parsers):
diff --git a/src/xpk/parser/workload_test.py b/src/xpk/parser/workload_test.py
new file mode 100644
index 000000000..7e0d53d19
--- /dev/null
+++ b/src/xpk/parser/workload_test.py
@@ -0,0 +1,82 @@
+"""
+Copyright 2025 Google LLC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     https://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+import argparse
+from xpk.parser.workload import set_workload_create_parser
+from ..utils.feature_flags import FeatureFlags
+import pytest
+
+
+@pytest.fixture(autouse=True)
+def with_sub_slicing_enabled():
+  FeatureFlags.SUB_SLICING_ENABLED = True
+
+
+def test_workload_create_sub_slicing_topology_is_hidden_with_flag_off():
+  FeatureFlags.SUB_SLICING_ENABLED = False
+  parser = argparse.ArgumentParser()
+
+  set_workload_create_parser(parser)
+  help_str = parser.format_help()
+
+  assert "--sub-slicing" not in help_str
+
+
+def test_workload_create_sub_slicing_topology_is_shown_with_flag_on():
+  parser = argparse.ArgumentParser()
+
+  set_workload_create_parser(parser)
+  help_str = parser.format_help()
+
+  assert "--sub-slicing" in help_str
+
+
+def test_workload_create_sub_slicing_topology_is_none_by_default():
+  parser = argparse.ArgumentParser()
+
+  set_workload_create_parser(parser)
+  args = parser.parse_args([
+      "--cluster",
+      "test-cluster",
+      "--command",
+      "python3",
+      "--workload",
+      "test",
+      "--tpu-type",
+      "test-tpu",
+  ])
+
+  assert args.sub_slicing_topology is None
+
+
+def test_workload_create_sub_slicing_topology_can_be_set():
+  parser = argparse.ArgumentParser()
+
+  set_workload_create_parser(parser)
+  args = parser.parse_args([
+      "--cluster",
+      "test-cluster",
+      "--command",
+      "python3",
+      "--workload",
+      "test",
+      "--tpu-type",
+      "test-tpu",
+      "--sub-slicing-topology",
+      "2x2",
+  ])
+
+  assert args.sub_slicing_topology is "2x2"