diff --git a/nimp/base_commands/package.py b/nimp/base_commands/package.py
index 940810af..108be451 100644
--- a/nimp/base_commands/package.py
+++ b/nimp/base_commands/package.py
@@ -258,7 +258,10 @@ def run(self, env):
         )
 
         if env.variant:
-            variant_configuration_directory = package_configuration.configuration_directory + '/Variants/Active'
+            if env.use_ue_custom_config:
+                variant_configuration_directory = package_configuration.configuration_directory + '/Custom/' + env.variant
+            else:
+                variant_configuration_directory = package_configuration.configuration_directory + '/Variants/Active'
             if os.path.exists(variant_configuration_directory):
                 package_configuration.configuration_directory = variant_configuration_directory
             variant_resource_directory = package_configuration.resource_directory + '/Variants/' + env.variant
@@ -408,7 +411,8 @@ def _setup_default_config_file(config_file):
 
         is_monorepo_behavior = env.unreal_version > 4.24
         should_configure_variant = is_monorepo_behavior and env.variant is not None
-        active_configuration_directory = f'{project_directory}/Config/Variants/Active'
+        variants_directory = 'Custom' if env.use_ue_custom_config else 'Variants'
+        active_configuration_directory = f'{project_directory}/Config/{variants_directory}/Active'
         if env.unreal_platform == 'PS5':
             dst_title_conf = env.format('{uproject_dir}/Platforms/PS5/Build/TitleConfiguration.json')
 
@@ -416,13 +420,14 @@ def _setup_default_config_file(config_file):
             if is_monorepo_behavior:
                 _try_remove(active_configuration_directory, False)
             if should_configure_variant:
-                variant_configuration_directory = f'{project_directory}/Config/Variants/{env.variant}'
+                variant_configuration_directory = f'{project_directory}/Config/{variants_directory}/{env.variant}'
                 if not os.path.exists(variant_configuration_directory):
                     raise FileNotFoundError(f"Variant not found : {variant_configuration_directory}")
-                logging.info(f'configuring variant {env.variant} in : {active_configuration_directory}')
+                logging.info('configuring variant %s in : %s', env.variant, active_configuration_directory)
                 shutil.copytree(
                     variant_configuration_directory, active_configuration_directory, copy_function=shutil.copyfile
                 )
+
                 # necessary for shader debug info in case no defaultEngine is present
                 _setup_default_config_file(f'{active_configuration_directory}/DefaultEngine.ini')
                 _setup_default_config_file(f'{active_configuration_directory}/DefaultGame.ini')
@@ -457,13 +462,19 @@ def enumerate_unreal_configs(env):
         # order matters: from deepest ini to broadest (deep<-variant<-platform<-game)
         config_files_patterns = []
         if hasattr(env, 'variant') and env.variant:
-            config_files_patterns.extend(
+            if env.use_ue_custom_config:
+                config_files_patterns.extend([
+                    '{uproject_dir}/Config/{cook_platform}/Custom/{variant}/{cook_platform}Game.ini',
+                    '{uproject_dir}/Config/Custom/{variant}/DefaultGame.ini'
+                ])
+            else:
+                config_files_patterns.extend(
                 [
-                    '{uproject_dir}/Config/Variants/Active/{cook_platform}/{cook_platform}Game.ini',
-                    '{uproject_dir}/Config/Variants/{variant}/{cook_platform}/{cook_platform}Game.ini',
-                    '{uproject_dir}/Config/Variants/Active/DefaultGame.ini',
-                    '{uproject_dir}/Config/Variants/{variant}/DefaultGame.ini',
-                ]
+                        '{uproject_dir}/Config/Variants/Active/{cook_platform}/{cook_platform}Game.ini',
+                        '{uproject_dir}/Config/Variants/{variant}/{cook_platform}/{cook_platform}Game.ini',
+                        '{uproject_dir}/Config/Variants/Active/DefaultGame.ini',
+                        '{uproject_dir}/Config/Variants/{variant}/DefaultGame.ini',
+                    ]
             )
         config_files_patterns.extend(
             [
@@ -784,7 +795,10 @@ def cook(env, package_configuration):
             cook_command += shlex.split(option)
 
         # Load the active variant
-        cook_command += ['-DNEConfigVariant']
+        if env.variant:
+            if env.use_ue_custom_config:
+                    cook_command += [ f'-CustomConfig={env.variant}' ]
+            cook_command += [ '-DNEConfigVariant' ]
 
         if package_configuration.shader_debug_info:
             sdb_path = (
@@ -892,6 +906,10 @@ def stage(env, package_configuration):
             if env.is_dne_legacy_ue4:
                 stage_command += ['-SkipPak']
 
+            if env.use_ue_custom_config:
+                if env.variant:
+                    stage_command += [ f'-CustomConfig={env.variant}' ]
+
             stage_success = nimp.sys.process.call(stage_command, dry_run=env.dry_run, heartbeat=60)
             if stage_success != 0:
                 raise RuntimeError('Stage failed')
@@ -1505,6 +1523,10 @@ def package_with_uat(env, package_configuration):
             if package_configuration.no_compile_packaging:
                 package_command += ['-NoCompile']
 
+            if env.use_ue_custom_config:
+                if env.variant:
+                    package_command += [ f'-CustomConfig={env.variant}' ]
+
             for option in package_configuration.extra_options:
                 package_command += shlex.split(option)