Hi José,

If you would like to forward for example one waiting queue to another, just make 2 waiting queues, like this:

200 | WQ-Sales
201 | WQ-Sales-Overflow

Put in a CFNR at WQ-Sales to WQ-Sales-Overflow or simply number 201.

You can do the same for users.

If you do not specify a response timeout at the object itself, it will use the PBX default response timeout set at PBX -> Config -> Response Timeout.

The CFB you are using is what happens then the called user is busy.
Please keep in mind personal forwardings do not apply when calling waiting queues, unless specified (click on queue, click tab 'queue', check 'execute operator cfb/cfnr').

Hope this helps, if you still have a question, please make screenshots and attach them.