Append rows from other tabs without losing formatting - google-apps-script

Question

In an effort to organize a set of bank account and credit card statements, I download them. Then I open them in Excel or Google Sheets, reorganize them in matching columns, put all in one tab (TOTAL), and then sort.
The question is now how I do the copy from the individual sheets. I think I'm pretty close after pasting and repeating (the manual way) some function I found by searching. The problem is that this function removes all formatting from the source rows
Example sheet
The last tab example_TOTAL is put there only to show how I want tab TOTAL to look after the process is done.
Here's my function so far which does the most, but erases formatting (colors).
function Copy() {
var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
var ss = spreadsheet.getSheetByName('TabA'); //replace with source Sheet tab name
var range = ss.getRange('A1:L'); //assign the range you want to copy
var data = range.getValues();
var ts = spreadsheet.getSheetByName('TOTAL'); //replace with destination Sheet tab name
ts.getRange(ts.getLastRow()+1, 1, data.length, data[0].length).setValues(data);
var ss = spreadsheet.getSheetByName('TabB'); //replace with source Sheet tab name
var range = ss.getRange('A1:L'); //assign the range you want to copy
var data = range.getValues();
ts.getRange(ts.getLastRow()+1, 1, data.length, data[0].length).setValues(data);
var ss = spreadsheet.getSheetByName('TabC'); //replace with source Sheet tab name
var range = ss.getRange('A1:L'); //assign the range you want to copy
var data = range.getValues();
ts.getRange(ts.getLastRow()+1, 1, data.length, data[0].length).setValues(data);
var ss = spreadsheet.getSheetByName('TabD'); //replace with source Sheet tab name
var range = ss.getRange('A1:L'); //assign the range you want to copy
var data = range.getValues();
ts.getRange(ts.getLastRow()+1, 1, data.length, data[0].length).setValues(data);
}
function copyFromTo() {
var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
var ss = spreadsheet.getSheetByName('TabA');
var copy = ss.getRange('A1:L');
var target = spreadsheet.getSheetByName('TOTAL');
var dest = target.getRange('A1:L');
copy.copyTo(dest);
var ss = spreadsheet.getSheetByName('TabB');
var copy = ss.getRange('A1:L');
copy.copyTo(dest);
var ss = spreadsheet.getSheetByName('TabC');
var copy = ss.getRange('A1:L');
copy.copyTo(dest);
var ss = spreadsheet.getSheetByName('TabD');
var copy = ss.getRange('A1:L');
copy.copyTo(dest);
}
How can I append from these sheets and still keep the formatting?