diff --git a/ax/preview/api/client.py b/ax/preview/api/client.py
index 2fbbcd2c3a1..d513a62e73b 100644
--- a/ax/preview/api/client.py
+++ b/ax/preview/api/client.py
@@ -16,7 +16,6 @@
 from ax.core.metric import Metric
 from ax.core.optimization_config import OptimizationConfig
 from ax.core.runner import Runner
-from ax.core.search_space import SearchSpace
 from ax.early_stopping.strategies import BaseEarlyStoppingStrategy
 from ax.exceptions.core import UnsupportedError
 from ax.modelbridge.dispatch_utils import choose_generation_strategy
@@ -41,6 +40,7 @@
 class Client:
     _experiment: Experiment | None = None
     _generation_strategy: GenerationStrategyInterface | None = None
+    _early_stopping_strategy: BaseEarlyStoppingStrategy | None = None
 
     def __init__(
         self,
@@ -180,51 +180,79 @@ def configure_metrics(self, metrics: Sequence[IMetric]) -> None:
     # -------------------- Section 1.2: Set (not API) -------------------------------
     def set_experiment(self, experiment: Experiment) -> None:
         """
+        This method is not part of the API and is provided (without guarantees of
+        method signature stability) for the convenience of some developers, power
+        users, and partners.
+
         Overwrite the existing Experiment with the provided Experiment.
 
         Saves to database on completion if db_config is present.
         """
-        ...
-
-    def set_search_space(self, search_space: SearchSpace) -> None:
-        """
-        Overwrite the existing SearchSpace with the provided SearchSpace.
+        self._experiment = experiment
 
-        Saves to database on completion if db_config is present.
-        """
-        ...
+        if self.db_config is not None:
+            # TODO[mpolson64] Save to database
+            ...
 
     def set_optimization_config(self, optimization_config: OptimizationConfig) -> None:
         """
+        This method is not part of the API and is provided (without guarantees of
+        method signature stability) for the convenience of some developers, power
+        users, and partners.
+
         Overwrite the existing OptimizationConfig with the provided OptimizationConfig.
 
         Saves to database on completion if db_config is present.
         """
-        ...
+        self._none_throws_experiment().optimization_config = optimization_config
+
+        if self.db_config is not None:
+            # TODO[mpolson64] Save to database
+            ...
 
     def set_generation_strategy(
         self, generation_strategy: GenerationStrategyInterface
     ) -> None:
         """
+        This method is not part of the API and is provided (without guarantees of
+        method signature stability) for the convenience of some developers, power
+        users, and partners.
+
         Overwrite the existing GenerationStrategy with the provided GenerationStrategy.
 
         Saves to database on completion if db_config is present.
         """
-        ...
+        self._generation_strategy = generation_strategy
+
+        if self.db_config is not None:
+            # TODO[mpolson64] Save to database
+            ...
 
     def set_early_stopping_strategy(
         self, early_stopping_strategy: BaseEarlyStoppingStrategy
     ) -> None:
         """
+        This method is not part of the API and is provided (without guarantees of
+        method signature stability) for the convenience of some developers, power
+        users, and partners.
+
         Overwrite the existing EarlyStoppingStrategy with the provided
         EarlyStoppingStrategy.
 
         Saves to database on completion if db_config is present.
         """
-        ...
+        self._early_stopping_strategy = early_stopping_strategy
+
+        if self.db_config is not None:
+            # TODO[mpolson64] Save to database
+            ...
 
     def set_runner(self, runner: Runner) -> None:
         """
+        This method is not part of the API and is provided (without guarantees of
+        method signature stability) for the convenience of some developers, power
+        users, and partners.
+
         Attaches a Runner to the Experiment.
 
         Saves to database on completion if db_config is present.
@@ -233,6 +261,10 @@ def set_runner(self, runner: Runner) -> None:
 
     def set_metrics(self, metrics: Sequence[Metric]) -> None:
         """
+        This method is not part of the API and is provided (without guarantees of
+        method signature stability) for the convenience of some developers, power
+        users, and partners.
+
         Finds equivallently named Metric that already exists on the Experiment and
         replaces it with the Metric provided, or adds the Metric provided to the
         Experiment as tracking metrics.
diff --git a/ax/preview/api/tests/test_client.py b/ax/preview/api/tests/test_client.py
index 4767a57cb3c..11960a53365 100644
--- a/ax/preview/api/tests/test_client.py
+++ b/ax/preview/api/tests/test_client.py
@@ -26,6 +26,12 @@
     RangeParameterConfig,
 )
 from ax.utils.common.testutils import TestCase
+from ax.utils.testing.core_stubs import (
+    get_branin_experiment,
+    get_branin_optimization_config,
+    get_percentile_early_stopping_strategy,
+)
+from ax.utils.testing.modeling_stubs import get_generation_strategy
 from pyre_extensions import none_throws
 
 
@@ -154,3 +160,45 @@ def test_configure_optimization(self) -> None:
                 objective="ne",
                 outcome_constraints=["qps >= 0"],
             )
+
+    def test_set_experiment(self) -> None:
+        client = Client()
+        experiment = get_branin_experiment()
+
+        client.set_experiment(experiment=experiment)
+
+        self.assertEqual(client._experiment, experiment)
+
+    def test_set_optimization_config(self) -> None:
+        client = Client()
+        optimization_config = get_branin_optimization_config()
+
+        with self.assertRaisesRegex(AssertionError, "Experiment not set"):
+            client.set_optimization_config(optimization_config=optimization_config)
+
+        client.set_experiment(experiment=get_branin_experiment())
+        client.set_optimization_config(
+            optimization_config=optimization_config,
+        )
+
+        self.assertEqual(
+            none_throws(client._experiment).optimization_config, optimization_config
+        )
+
+    def test_set_generation_strategy(self) -> None:
+        client = Client()
+        client.set_experiment(experiment=get_branin_experiment())
+
+        generation_strategy = get_generation_strategy()
+
+        client.set_generation_strategy(generation_strategy=generation_strategy)
+        self.assertEqual(client._generation_strategy, generation_strategy)
+
+    def test_set_early_stopping_strategy(self) -> None:
+        client = Client()
+        early_stopping_strategy = get_percentile_early_stopping_strategy()
+
+        client.set_early_stopping_strategy(
+            early_stopping_strategy=early_stopping_strategy
+        )
+        self.assertEqual(client._early_stopping_strategy, early_stopping_strategy)