diff --git a/cml/ports/source_adapters.py b/cml/ports/source_adapters.py
index 19222420bdce811c9d08d4d39c6339c671e1c3ad..08fc976b87fa226d231a62f7c81b13f981e2d85d 100644
--- a/cml/ports/source_adapters.py
+++ b/cml/ports/source_adapters.py
@@ -98,6 +98,10 @@ class PandasBlock:
     def rows(self):
         return self.__data_block.shape[1]
 
+    def new_block_from_rows_index(self, indices: List[int]):
+        data_from = self.__data_block.loc[indices]
+        return PandasBlock(data_from)
+
     def new_block_from(self, column_values):
         data_from = self.__data_block.loc[self.__data_block["T"].isin(
             column_values)]