With this script, I can import one spreadsheet into another spreadsheet in a tab.  

```
function importA() {
var values1 = SpreadsheetApp.openById('xxxurl').
  getSheetByName('xxxname').getRange('A1:DE300').getValues(); 
SpreadsheetApp.getActive().getSheetByName('TAB').
  getRange(1,1,values1.length,values1[0].length).setValues(values1)
  }

```

Now, I would like to import 3 spreadsheets one below the other (in the same tab), preserving any increase in the rows of each sheet at the same time.  

How could I proceed?