diff --git a/src/access_nri_intake/data/metadata_schema_experiment.json b/src/access_nri_intake/data/metadata_schema_experiment.json
index dd12b67..3e54b52 100644
--- a/src/access_nri_intake/data/metadata_schema_experiment.json
+++ b/src/access_nri_intake/data/metadata_schema_experiment.json
@@ -75,6 +75,9 @@
                             {
                                 "pattern": "^subhr$"
                             },
+                            {
+                                "pattern": "^subhrPt$"
+                            },
                             {
                                 "pattern": "^\\d+hr$"
                             },
diff --git a/src/access_nri_intake/data/metadata_schema_file.json b/src/access_nri_intake/data/metadata_schema_file.json
index 5e02b4b..86ccb53 100644
--- a/src/access_nri_intake/data/metadata_schema_file.json
+++ b/src/access_nri_intake/data/metadata_schema_file.json
@@ -74,6 +74,9 @@
                 {
                     "pattern": "^subhr$"
                 },
+                {
+                    "pattern": "^subhrPt$"
+                },
                 {
                     "pattern": "^\\d+hr$"
                 },
diff --git a/src/access_nri_intake/source/builders.py b/src/access_nri_intake/source/builders.py
index 4d61466..9d9dfcb 100644
--- a/src/access_nri_intake/source/builders.py
+++ b/src/access_nri_intake/source/builders.py
@@ -246,7 +246,7 @@ def parse_filename(
         patterns: list[str] | None = None,
         frequencies: dict = FREQUENCIES,
         redaction_fill: str = "X",
-    ) -> tuple[str, str | None, str | None, dict | None]:
+    ) -> tuple[str, str | None, str | None, dict]:
         """
         Parse an ACCESS model filename and return a file id and any time information
 
@@ -290,7 +290,7 @@ def parse_filename(
         # Parse file id
         file_id = filename
         timestamp = None
-        exargs = None
+        exargs = {}
         for pattern in patterns:
             match = re.match(pattern, file_id)
             if match:
@@ -764,7 +764,7 @@ def parser(cls, fpath, to_select=None):
     # TODO work out if more appropriate to override parse_ncfile
     # FIXME self --> cls
     @classmethod
-    def parse_ncfile(self, fpath, exargs={}):
+    def parse_ncfile(cls, file: str, time_dim: str = "time"):
         """
         Get Intake-ESM datastore entry info from an ACCESS netcdf file
         CMOR has its own base date format, length depends on frequency
@@ -784,12 +784,19 @@ def parse_ncfile(self, fpath, exargs={}):
             Stores extra arguments as frequency, date_range, variable etc, derived from fpattern
 
         """
+
+        file_path = Path(file)
+
+        file_id, filename_timestamp, filename_frequency, exargs = cls.parse_filename(
+            cls._get_relevant_filepath(file_path)
+        )
+
         time_format = "%Y-%m-%d, %H:%M:%S"
         # get format for dates based on dates lenght
         # dformat is the longest possible datetime format for cmor
         dformat = "%Y%m%d%H%M%S"
-        date_range = exargs.get("date_range", "")
-        if date_range == "":
+        date_range = exargs.get("date_range", None)
+        if date_range is None:
             start_date = "none"
             end_date = "none"
         else:
@@ -800,9 +807,11 @@ def parse_ncfile(self, fpath, exargs={}):
             te = datetime.strptime(te, cmor_format)
             end_date = te.strftime(time_format)
 
-        variable = exargs.get("variable", "")
+        variable = exargs.get("variable", None)
+        if variable is None:
+            raise RuntimeError(f"Unable to parse variable name from {file}")
         with xr.open_dataset(
-            fpath,
+            file,
             chunks={},
             decode_cf=False,
             decode_times=False,
@@ -813,12 +822,12 @@ def parse_ncfile(self, fpath, exargs={}):
             variable_standard_name = attrs.get("standard_name", "unknown")
             variable_cell_methods = attrs.get("cell_methods", "unknown")
             variable_units = attrs.get("units", "unknown")
-            tracking_id = ds.attrs.get("tracking_id", "unknown")
+            # tracking_id = ds.attrs.get("tracking_id", "unknown")
 
         output_nc_info = _NCFileInfo(
-            filename=Path(fpath).name,
-            path=fpath,
-            file_id=tracking_id,
+            filename=Path(file).name,
+            path=file,
+            file_id=file_id,
             filename_timestamp=date_range,
             frequency=exargs.get("frequency", ""),
             start_date=start_date,
@@ -830,4 +839,4 @@ def parse_ncfile(self, fpath, exargs={}):
             variable_cell_methods=[variable_cell_methods],
         )
 
-        return output_nc_info, exargs
+        return output_nc_info