combine some excel files

You can use several Read Excel operators to get your spreadsheets in, then Append, and Write Excel.

Hi @sara20 you could use a Loop Files operator  with a Read Excel inside and and an Append and a Write Excel angt the end.
You could copy this basic setup
Inside the Loop Files you could do any type of data cleansing and filtering that you could need.

<?xml version="1.0" encoding="UTF-8"?><process version="9.7.001">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="9.7.001" expanded="true" name="Process">
    <parameter key="logverbosity" value="init"/>
    <parameter key="random_seed" value="2001"/>
    <parameter key="send_mail" value="never"/>
    <parameter key="notification_email" value=""/>
    <parameter key="process_duration_for_mail" value="30"/>
    <parameter key="encoding" value="SYSTEM"/>
    <process expanded="true">
      <operator activated="true" class="concurrency:loop_files" compatibility="9.7.001" expanded="true" height="82" name="Loop Files" width="90" x="313" y="34">
        <parameter key="filter_type" value="regex"/>
        <parameter key="filter_by_regex" value=".*xls"/>
        <parameter key="recursive" value="false"/>
        <parameter key="enable_macros" value="false"/>
        <parameter key="macro_for_file_name" value="file_name"/>
        <parameter key="macro_for_file_type" value="file_type"/>
        <parameter key="macro_for_folder_name" value="folder_name"/>
        <parameter key="reuse_results" value="false"/>
        <parameter key="enable_parallel_execution" value="true"/>
        <process expanded="true">
          <operator activated="true" class="read_excel" compatibility="9.7.001" expanded="true" height="68" name="Read Excel" width="90" x="246" y="34">
            <parameter key="sheet_selection" value="sheet number"/>
            <parameter key="sheet_number" value="1"/>
            <parameter key="imported_cell_range" value="A1"/>
            <parameter key="encoding" value="SYSTEM"/>
            <parameter key="first_row_as_names" value="true"/>
            <list key="annotations"/>
            <parameter key="date_format" value=""/>
            <parameter key="time_zone" value="SYSTEM"/>
            <parameter key="locale" value="English (United States)"/>
            <parameter key="read_all_values_as_polynominal" value="false"/>
            <list key="data_set_meta_data_information"/>
            <parameter key="read_not_matching_values_as_missings" value="true"/>
            <parameter key="datamanagement" value="double_array"/>
            <parameter key="data_management" value="auto"/>
          </operator>
          <connect from_port="file object" to_op="Read Excel" to_port="file"/>
          <connect from_op="Read Excel" from_port="output" to_port="output 1"/>
          <portSpacing port="source_file object" spacing="0"/>
          <portSpacing port="source_input 1" spacing="0"/>
          <portSpacing port="sink_output 1" spacing="0"/>
          <portSpacing port="sink_output 2" spacing="0"/>
        </process>
      </operator>
      <operator activated="true" class="append" compatibility="9.7.001" expanded="true" height="82" name="Append" width="90" x="447" y="34">
        <parameter key="datamanagement" value="double_array"/>
        <parameter key="data_management" value="auto"/>
        <parameter key="merge_type" value="all"/>
      </operator>
      <operator activated="true" class="write_excel" compatibility="9.7.001" expanded="true" height="103" name="Write Excel" width="90" x="581" y="34">
        <parameter key="file_format" value="xlsx"/>
        <enumeration key="sheet_names"/>
        <parameter key="sheet_name" value="RapidMiner Data"/>
        <parameter key="date_format" value="yyyy-MM-dd HH:mm:ss"/>
        <parameter key="number_format" value="#.0"/>
        <parameter key="encoding" value="SYSTEM"/>
      </operator>
      <connect from_op="Loop Files" from_port="output 1" to_op="Append" to_port="example set 1"/>
      <connect from_op="Append" from_port="merged set" to_op="Write Excel" to_port="input"/>
      <connect from_op="Write Excel" from_port="file" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>

jacobcybulski,                         
MarcoBarradas,

Hello 

Thank you very much for your answers. I will try them.

Best regards
Sara