This could be done with simple code:
function moveCols() {
var ss = SpreadsheetApp.getActive();
var sourceSheet = ss.getSheetByName('Sheet1');
var destSheet = ss.getSheetByName('Sheet2');
sourceSheet.getRange('A:A').moveTo(destSheet.getRange('G1'))
sourceSheet.getRange('B:B').moveTo(destSheet.getRange('I1'))
sourceSheet.getRange('C:C').moveTo(destSheet.getRange('L1'))
}
If you only want to copy the data (and not move it) change the .moveTo() method to copyTo().
EDIT: If you need to move the columns to another spreadsheet, try:
function moveCols() {
var sourceSheet = SpreadsheetApp.getActive()
.getSheetByName('Sheet1'),
destSheet = SpreadsheetApp.openById('ID_OF_DESTINATION_SHEET')
.getSheetByName('Sheet2'),
sourceRanges = ['A:A', 'B:B', 'C:C'],
targetRanges = [7, 9, 12]
.map(function (r, i) {
var sr = sourceSheet.getRange(sourceRanges[i]),
val = sr.getValues();
destSheet.getRange(1, r, val.length, val[0].length)
.setValues(val);
sr.clear()
});
}