code: @Override
  	public boolean addLinkedWorkbook(String name, InputStream inputStream, String password) throws FormatNotUnderstoodException {
  		// check if already added
  		if (this.addedFormulaEvaluators.containsKey(name)) {
  			return false;
  		}
  		LOG.debug("Start adding  \""+name+"\" to current workbook");
  		// create new parser, select all sheets, no linkedworkbookpasswords,no metadatafilter
  		HadoopOfficeReadConfiguration linkedWBHOCR = new HadoopOfficeReadConfiguration();
  		linkedWBHOCR.setLocale(this.hocr.getLocale());
  		linkedWBHOCR.setSheets(null);
  		linkedWBHOCR.setIgnoreMissingLinkedWorkbooks(this.hocr.getIgnoreMissingLinkedWorkbooks());
  		linkedWBHOCR.setFileName(name);
  		linkedWBHOCR.setPassword(password);
  		linkedWBHOCR.setMetaDataFilter(null);
  		MSExcelParser linkedWBMSExcelParser = new MSExcelParser(linkedWBHOCR,null);
  		// parse workbook 
  	
  			linkedWBMSExcelParser.parse(inputStream);
  		
  		// add linked workbook
  		this.addedWorkbooks.add(linkedWBMSExcelParser.getCurrentWorkbook());
  		this.addedFormulaEvaluators.put(name,linkedWBMSExcelParser.getCurrentFormulaEvaluator());
  		this.formulaEvaluator.setupReferencedWorkbooks(addedFormulaEvaluators);
  	
  		return true;
  	}
docs: Adds a linked workbook that is referred from this workbook. If the filename is already in the list then it is not processed twice. Note that the inputStream is closed after parsing
  
  @param name fileName (without path) of the workbook
  @param inputStream content of the linked workbook
  @param password if document is encrypted, null if not encrypted
  
  @return true if it has been added, false if it has been already added
  
  @throws org.zuinnote.hadoop.office.format.common.parser.FormatNotUnderstoodException in case there are issues reading from the Excel file