diff --git a/pipelines/steps/join_tables.py b/pipelines/steps/join_tables.py
new file mode 100644
index 0000000..b7448ec
--- /dev/null
+++ b/pipelines/steps/join_tables.py
@@ -0,0 +1,75 @@
+import argparse
+import os
+import pandas as pd
+import json
+import os
+import pandas as pd
+
+def join_tables(csv_files: list):
+    """
+    Joins multiple CSV files based on their metadata-defined datetime column.
+
+    Parameters
+    ----------
+    csv_files : list
+        List of paths to CSV files.
+
+    Returns
+    -------
+    pd.DataFrame
+        Merged DataFrame.
+    """
+    if not all(isinstance(item, str) for item in csv_files):
+        raise TypeError(f"Invalid parameter. csv_files contain non-str items: {[item for item in csv_files if not isinstance(item, str)]}")
+
+    if not all(os.path.exists(item) and item.endswith('.csv') for item in csv_files):
+        raise RuntimeError("Parameter csv_files contains either an unreachable/broken path or a non-CSV file.")
+
+    acum_df = pd.read_csv(csv_files[0])
+    left_datetime_var = get_metadata(csv_files[0]).get('datetime_var', None)
+
+    if left_datetime_var is None:
+        raise ValueError(f"Missing datetime_var metadata in {csv_files[0]}")
+
+    for idx in range(1, len(csv_files)):
+        append_df = pd.read_csv(csv_files[idx])
+        right_datetime_var = get_metadata(csv_files[idx]).get('datetime_var', None)
+
+        if right_datetime_var is None:
+            raise ValueError(f"Missing datetime_var metadata in {csv_files[idx]}")
+
+        acum_df = acum_df.merge(append_df, left_on=left_datetime_var, right_on=right_datetime_var, how='inner')
+
+    return acum_df
+
+    
+def get_metadata(path_to_file):
+
+    path, filename = os.path.split(path_to_file)
+
+    path_to_metadata = None
+    for item in os.listdir(path):
+        if 'metadata.json' in item:
+            path_to_metadata = os.path.normpath(os.path.join(path,item))
+    metadata = {}
+    if path_to_file:
+        with open(path_to_metadata,'r') as stream:
+            metadata = json.load(stream)
+    
+        metadata = metadata.get(filename,{})
+
+    return metadata
+
+if __name__ == "__main__":
+    
+    path1 = 'data/collection_JFJ_2024_LeilaS_2025-02-17_2025-02-17/ACSM_TOFWARE_processed/2024/ACSM_JFJ_2024_timeseries_calibrated.csv'
+    path2 = 'data/collection_JFJ_2024_LeilaS_2025-02-17_2025-02-17/ACSM_TOFWARE_processed/2024/ACSM_JFJ_2024_timeseries_calibration_factors.csv'
+    path3 = 'data/collection_JFJ_2024_LeilaS_2025-02-17_2025-02-17/ACSM_TOFWARE_flags/2024/ACSM_JFJ_2024_timeseries_flags.csv'
+
+    acum_df = join_tables([path1,path2])
+
+    acum_df.to_csv('data/all_table.txt',sep='\t',index=None)
+
+    acum_df = join_tables([path3])
+
+    acum_df.to_csv('data/all_table_flags.txt',sep='\t',index=None)
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