diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index b4a3d6c06..f206702b4 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,6 +6,12 @@ dcicutils
 Change Log
 ----------
 
+8.18.3
+======
+* dmichaels / 2025-03-05 / branch: dmichaels-20250305-add-portal-get-schema-super-types / PR-328
+  - Added method portal_utils.get_schema_super_type_names (for use by smaht-submitr).
+
+
 8.18.1
 ======
 * dmichaels / 2025-02-28 / branch: dmichaels-20250228-correct-submitr-config-path / PR-327
diff --git a/dcicutils/portal_utils.py b/dcicutils/portal_utils.py
index b2378c75a..5dde8614d 100644
--- a/dcicutils/portal_utils.py
+++ b/dcicutils/portal_utils.py
@@ -471,6 +471,19 @@ def list_breadth_first(super_type_map: dict, super_type_name: str) -> dict:
             super_type_map_flattened[super_type_name] = list_breadth_first(super_type_map, super_type_name)
         return super_type_map_flattened
 
+    @lru_cache(maxsize=100)
+    def get_schema_super_type_names(self, schema_name: str, include_schema_name: bool = False) -> List[str]:
+        super_types = set()
+        if isinstance(schema_name, str) and (schema_name := self.schema_name(schema_name)):
+            if isinstance(super_type_map := self.get_schemas_super_type_map(), dict):
+                for super_type_name in super_type_map:
+                    if schema_name in super_type_map[super_type_name]:
+                        super_types.add(super_type_name)
+        super_types = list(super_types)
+        if (include_schema_name is True) and self.get_schema(schema_name):
+            super_types.insert(0, schema_name)
+        return super_types
+
     @lru_cache(maxsize=100)
     def get_schema_subtype_names(self, type_name: str) -> List[str]:
         if not (schemas_super_type_map := self.get_schemas_super_type_map()):
diff --git a/dcicutils/submitr/custom_excel.py b/dcicutils/submitr/custom_excel.py
index fdf8b5cbb..9f4ea5291 100644
--- a/dcicutils/submitr/custom_excel.py
+++ b/dcicutils/submitr/custom_excel.py
@@ -95,7 +95,8 @@ def sheet_reader(self, sheet_name: str) -> ExcelSheetReader:
         return CustomExcelSheetReader(self, sheet_name=sheet_name, workbook=self._workbook,
                                       custom_column_mappings=self._custom_column_mappings)
 
-    def effective_sheet_name(self, sheet_name: str) -> str:
+    @staticmethod
+    def effective_sheet_name(sheet_name: str) -> str:
         if (underscore := sheet_name.find("_")) > 1:
             return sheet_name[underscore + 1:]
         return sheet_name
@@ -151,11 +152,21 @@ def __init__(self, *args, **kwargs) -> None:
         ARGUMENT_NAME_CUSTOM_COLUMN_MAPPINGS = "custom_column_mappings"
         self._custom_column_mappings = None
         if ARGUMENT_NAME_CUSTOM_COLUMN_MAPPINGS in kwargs:
+            def lookup_custom_column_mappings(custom_column_mappings: dict, sheet_name: str) -> Optional[dict]:
+                if isinstance(custom_column_mappings, dict) and isinstance(sheet_name, str):
+                    if isinstance(found_custom_column_mappings := custom_column_mappings.get(sheet_name), dict):
+                        return found_custom_column_mappings
+                    if (effective_sheet_name := CustomExcel.effective_sheet_name(sheet_name)) != sheet_name:
+                        if isinstance(found_custom_column_mappings :=
+                                      custom_column_mappings.get(effective_sheet_name), dict):
+                            return found_custom_column_mappings
+                return None
             custom_column_mappings = kwargs[ARGUMENT_NAME_CUSTOM_COLUMN_MAPPINGS]
             del kwargs[ARGUMENT_NAME_CUSTOM_COLUMN_MAPPINGS]
             if not (isinstance(custom_column_mappings, dict) and
                     isinstance(sheet_name := kwargs.get(ARGUMENT_NAME_SHEET_NAME, None), str) and
-                    isinstance(custom_column_mappings := custom_column_mappings.get(sheet_name), dict)):
+                    isinstance(custom_column_mappings :=
+                               lookup_custom_column_mappings(custom_column_mappings, sheet_name), dict)):
                 custom_column_mappings = None
             self._custom_column_mappings = custom_column_mappings
         super().__init__(*args, **kwargs)
diff --git a/pyproject.toml b/pyproject.toml
index 6ebeb31cb..6e2a22878 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "dcicutils"
-version = "8.18.1"
+version = "8.18.3"
 description = "Utility package for interacting with the 4DN Data Portal and other 4DN resources"
 authors = ["4DN-DCIC Team <support@4dnucleome.org>"]
 license = "MIT"