Transactions in Google Sheet - Move value from, to - if-statement

Question

I'm trying to make a document to manage my finances on google sheet, actually, I would like to be able to track the transactions I make between my accounts.
I made this sheet to be able to sum things up.
Actually, I would be able to tell the document i'm making a transaction from - to (in that case, from content 1 to content 3) and to add a new value.
I don't know how to tell google sheet to "move" 25 from content 1 to content 3 or any other content.
Thanks for the precious help.

Answer 1

You can use an Apps Script onEdit trigger so fire the transactions, and use checkboxes to track which transaction should be fired, so that the transaction takes place whenever the corresponding checkbox is checked.
First, add the checkboxes to the transaction rows by selecting the appropriate cells and click Insert > Checkbox.
Then, open the script bound to your spreadsheet by selecting Tools > Script editor, copy the following function, and save the project. Now every time a checkbox is checked, the corresponding transaction takes place in B2:E3, and when it is unchecked the transaction gets undone (the from and the to exchange places, and the money goes the other way):
function onEdit(e) {
var range = e.range;
var col = range.getColumn();
var row = range.getRow();
var checkbox = e.value;
var sheet = range.getSheet();
if (col === 6 && row > 8) {
var from = sheet.getRange(row, 3).getValue();
var to = sheet.getRange(row, 4).getValue();
var value = sheet.getRange(row, 5). getValue();
var valuesToUpdate = sheet.getRange("B2:E2").getValues();
var fromIndex = valuesToUpdate[0].findIndex(contents => contents === from);
var toIndex = valuesToUpdate[0].findIndex(contents => contents === to);
var fromRange = sheet.getRange(3, fromIndex + 2);
var toRange = sheet.getRange(3, toIndex + 2);
if (checkbox === "TRUE") { // MAKE TRANSACTION
fromRange.setValue(fromRange.getValue() - value);
toRange.setValue(toRange.getValue() + value);
} else if (checkbox === "FALSE") { // UNDO TRANSACTION
fromRange.setValue(fromRange.getValue() + value);
toRange.setValue(toRange.getValue() - value);
}
}
}
This function will fire every time the spreadsheet is edited, but you only want to update the transaction summary whenever the edited cell is a checkbox and this checkbox is checked. The function is checking for that, using the information passed to the onEdit function through the event object (e), which contains information on the edited cell (its value, its range, etc.):
Reference:
onEdit(e)
Event Objects: Edit