I’m working with Google Apps Script to insert/copy text from one Google Document into another. These text can include various types of content, including bullet and numbered lists. However, I’m encountering two issues:

1. When inserting a bullet list, all bullet icons are not preserved, resulting in a plain list without the intended bullet styling.
2. When inserting a numbered list, the numbering continues from the last number, rather than restarting from 1. For example, if I insert a text with a list numbered from 1 to 5, and then insert it again, it continues numbering from 6 instead of restarting from 1.

Original document

After Insert

Bellow is my code and I have attached screenshots of original document and when inserting/copying that into new document.
I am expecting that when inserting the clause/text it should preserve as it is with original list formatting which is there in original document shared in screenshots.

How to Use:

1. Create a new Google Apps Script project and paste the above code.
2. Save and authorize the script.
3. Run the script in any Google Document to test it out. The script will add a “Clause Manager” menu from which you can insert clauses by providing a Document ID.

This script should work as an add-on that you can use directly in any Google Document.

function onOpen() {
  DocumentApp.getUi().createMenu('Clause Manager')
    .addItem('Insert Clause', 'insertClause')
    .addToUi();
}

function insertClause() {
  const ui = DocumentApp.getUi();
  const response = ui.prompt('Enter the Clause Document ID:');
  
  if (response.getSelectedButton() == ui.Button.OK) {
    const clauseId = response.getResponseText();
    const document = DocumentApp.getActiveDocument();
    const cursor = document.getCursor();

    if (!cursor) {
      ui.alert('Cannot find a cursor in the document.');
      return;
    }

    const element = cursor.getElement();
    insertClauseInsideDocumentBody(document, element, clauseId, 'ClauseName');
  }
}

function insertClauseInsideDocumentBody(document, element, clauseId, clauseName) {
  try {
    const documentBody = document.getBody();
    let index = documentBody.getChildIndex(element);

    const clauseDocument = DocumentApp.openById(clauseId);
    const clauseBody = clauseDocument.getBody();

    if (clauseBody.getNumChildren() === 0) {
      DocumentApp.getUi().alert('The clause document is empty.');
      return;
    }

    const clauseElements = [];

    for (let i = 0; i < clauseBody.getNumChildren(); i++) {
      const child = clauseBody.getChild(i);
      const childContent = child.copy();
      let clauseElement;

      switch (child.getType()) {
        case DocumentApp.ElementType.PARAGRAPH: {
          const paraElement = documentBody.insertParagraph(index, childContent);
          clauseElement = paraElement;
          index++;
          break;
        }
        case DocumentApp.ElementType.LIST_ITEM: {
          const listElement = documentBody.insertListItem(index, childContent);
          listElement.setAttributes(child.getAttributes());
          clauseElement = listElement;
          index++;
          break;
        }
        case DocumentApp.ElementType.TABLE: {
          const tableElement = documentBody.insertTable(index, childContent);
          clauseElement = tableElement;
          index++;
          break;
        }
        case DocumentApp.ElementType.INLINE_IMAGE: {
          const imageElement = documentBody.insertImage(index, childContent);
          clauseElement = imageElement;
          index++;
          break;
        }
        default:
          clauseElement = null;
          break;
      }

      if (clauseElement) {
        clauseElements.push(clauseElement);
      }
    }

    const rangeBuilder = document.newRange();
    rangeBuilder.addElementsBetween(clauseElements[0].editAsText(), 1, clauseElements[clauseElements.length - 1].editAsText(), clauseElements[clauseElements.length - 1].editAsText().getText().length - 1);
    document.addNamedRange(clauseName, rangeBuilder.build());
    
    DocumentApp.getUi().alert('Clause inserted successfully.');
    
  } catch (error) {
    DocumentApp.getUi().alert('An error occurred: ' + error.message);
  }
}