Google Docs Invoice template with dynamically items row from Google Sheets - google-sheets

Question

I really need your help with this.
I have created an invoice template in Google Docs with databases flowed from Google sheets.
The problem is:
In the template (Google Docs), I only put a specific items line (eg 3 lines).
When the data is changed, such as the number of items lines are changing, how it's automatically gone through Google Docs if there are more than 3 items lines
Many thanks for your help.
Below is my script to get data from G-sheets to G-Docs template.
function Invoice() {
let copyFile = DriveApp.getFileById('id URL').makeCopy(),
copyID = copyFile.getId(),
copyDoc = DocumentApp.openById(copyID),
copyBody = copyDoc.getBody()
let activeSheet = SpreadsheetApp.getActiveSheet(),
numOfCol = activeSheet.getLastColumn(),
activeRowIndex = activeSheet.getActiveRange().getRowIndex(),
activeRow = activeSheet.getRange(activeRowIndex, 1, 1, numOfCol).getValues(),
headerRow = activeSheet.getRange(1, 1, 1, numOfCol).getValues(),
columnIndex = 0
for (; columnIndex < headerRow[0].length; columnIndex++){
copyBody.replaceText('%' + headerRow[0][columnIndex] + '%', activeRow[0][columnIndex])
}
copyDoc.saveAndClose()
Here is screenshot of the files.
Data in G-sheet with the additional item (Item 4)
G-Docs template with specific 3 rows for 3 items lines
When I have 4 items, I must manually amend the G-Docs template. Is there any way to get its automatically.

Answer 1

#Duc I don't think it's possible to pass the new header as placeholder in the GDoc, it sounds like an endless loop.
Unless you pass it as List_ITEM, but I am pretty sure you will lose formatting.