diff --git a/benchcab/benchcab.py b/benchcab/benchcab.py
index 548ee031..6b04fc11 100644
--- a/benchcab/benchcab.py
+++ b/benchcab/benchcab.py
@@ -116,8 +116,6 @@ def _initialise_tasks(self) -> list[Task]:
         )
         return self.tasks
 
-    # TODO(Sean) this method should be the endpoint for the `fluxsite-submit-job`
-    # command line argument.
     def fluxsite_submit_job(self) -> None:
         """Submits the PBS job script step in the fluxsite test workflow."""
 
@@ -276,6 +274,9 @@ def main(self):
         if self.args.subcommand == "fluxsite-setup-work-dir":
             self.fluxsite_setup_work_directory()
 
+        if self.args.subcommand == "fluxsite-submit-job":
+            self.fluxsite_submit_job()
+
         if self.args.subcommand == "fluxsite-run-tasks":
             self.fluxsite_run_tasks()
 
diff --git a/benchcab/cli.py b/benchcab/cli.py
index 413946f9..2dc266d9 100644
--- a/benchcab/cli.py
+++ b/benchcab/cli.py
@@ -39,7 +39,10 @@ def generate_parser() -> argparse.ArgumentParser:
         action="store_true",
         help="Force benchcab to execute tasks on the current compute node.",
     )
-    args_run_subcommand.add_argument(
+
+    # parent parser that contains arguments common to all composite subcommands
+    args_composite_subcommand = argparse.ArgumentParser(add_help=False)
+    args_composite_subcommand.add_argument(
         "--skip",
         action="append",
         default=[],
@@ -68,7 +71,12 @@ def generate_parser() -> argparse.ArgumentParser:
     # subcommand: 'benchcab run'
     subparsers.add_parser(
         "run",
-        parents=[args_help, args_subcommand, args_run_subcommand],
+        parents=[
+            args_help,
+            args_subcommand,
+            args_run_subcommand,
+            args_composite_subcommand,
+        ],
         help="Run all test suites for CABLE.",
         description="""Runs all test suites for CABLE: fluxsite and spatial test suites. This
         command runs the full default set of tests for CABLE.""",
@@ -78,11 +86,16 @@ def generate_parser() -> argparse.ArgumentParser:
     # subcommand: 'benchcab fluxsite'
     subparsers.add_parser(
         "fluxsite",
-        parents=[args_help, args_subcommand, args_run_subcommand],
+        parents=[
+            args_help,
+            args_subcommand,
+            args_run_subcommand,
+            args_composite_subcommand,
+        ],
         help="Run the fluxsite test suite for CABLE.",
         description="""Runs the default fluxsite test suite for CABLE. This command is the
         equivalent of running 'benchcab checkout', 'benchcab build', 'benchcab
-        fluxsite-setup-work-dir', and 'benchcab fluxsite-run-tasks' sequentially.""",
+        fluxsite-setup-work-dir', and 'benchcab fluxsite-submit-job' sequentially.""",
         add_help=False,
     )
 
@@ -116,6 +129,15 @@ def generate_parser() -> argparse.ArgumentParser:
         add_help=False,
     )
 
+    # subcommand: 'benchcab fluxsite-submit-job'
+    subparsers.add_parser(
+        "fluxsite-submit-job",
+        parents=[args_help, args_subcommand, args_composite_subcommand],
+        help="Generate and submit the PBS job script for the fluxsite test suite.",
+        description="""Generates and submits the PBS job script for the fluxsite test suite.""",
+        add_help=False,
+    )
+
     # subcommand: 'benchcab fluxsite-run-tasks'
     subparsers.add_parser(
         "fluxsite-run-tasks",
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 96023bd8..df1d8ba9 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -45,6 +45,15 @@ def test_cli_parser():
         "verbose": False,
     }
 
+    # Success case: default fluxsite-submit-job command
+    res = vars(parser.parse_args(["fluxsite-submit-job"]))
+    assert res == {
+        "subcommand": "fluxsite-submit-job",
+        "config": "config.yaml",
+        "verbose": False,
+        "skip": [],
+    }
+
     # Success case: default fluxsite run-tasks command
     res = vars(parser.parse_args(["fluxsite-run-tasks"]))
     assert res == {