How can I make four different timestamps on the same sheet? - google-apps-script

Question

I'd like to use 4 different timestamps in a sheet based on columns titled timestamp 1 / timestamp 2. When the box is checked then the timestamp moves into the sequence column. Here is my script for the first chart. How can I make it for all four charts on that page? https://docs.google.com/spreadsheets/d/11AQMvhWbzgmLLPbdf94nW7D_Kkb1aQefrU755AOhkJo/edit?usp=sharing
function onEdit(event) {
const timezone = 'GMT-5';
const timestamp_format = 'HH:mm:ss'; // Timestamp Format.
const updateColName = 'Time Stamp 1';
const timeStampColName = 'Sequence 1';
const sheet = event.source.getSheetByName('Experiment - Training w/ Duration'); // Name of the sheet where you want to run this script.
const actRng = event.source.getActiveRange();
const editColumn = actRng.getColumn();
const index = actRng.getRowIndex();
const headers = sheet.getRange(1, 1, 1, sheet.getLastColumn()).getValues();
const dateCol = headers[0].indexOf(timeStampColName);
let updateCol = headers[0].indexOf(updateColName); updateCol += 1;
if (dateCol > -1 && index > 1 && editColumn == updateCol) { // only timestamp if 'Last Updated' header exists, but not in the header row itself!
const cell = sheet.getRange(index, dateCol + 1);
const date = Utilities.formatDate(new Date(), timezone, timestamp_format);
cell.setValue(date);
}
}