@praffulgoyal as @rfeigel has said: it all depends on your description of the challenges you face, like: repeated blocks that have a common identifier.
One way to do it is to identify the end of one block and then iterate over them. You can import the whole CSV first with the Fixed Width File Reader – KNIME Community Hub into one column - then identify the line which holds the block separator and then loop over the lines with a regular CSV reader with start and end line.