Actually I have in MyTable.php, ie, the following DS:

protected function dataSource()
    {
       return AutoMaker::table('portal_users');
    }

I would like to put all the SQLs in their own files, so I can reuse it if needed in other boards. The only way I know to do it now is like:

protected function dataSource()
    {
       return require('My_portal_users.sql.php');
    }

There is a better way? Maybe some dashboard class where I can have a file like MyQueries.php and use it where needed as in MyTable.php?

In add to the question, how to pass params to queries?

$query = AutoMaker::rawSQL("
    SELECT paymentDate, amount
    FROM payments
   WHERE amount > :someAmount
");

->params() does not seem to exist here.

It works!

Just to let it clear for others:

MyTable.php

...
class MyTable extends Table
{
    use MyQueries;

    protected function dataSource()
        {
           return $this->getCustomerTable();
        }
...

Thank you.