Automatic transports scheduling in ECC

Dear Friends,

We are planning to automate the transports in our Quality system. We have concern for the following, please can u kindly help us with the same.

If we automate the transports in SAP, will the old released transports to QA but not transported to QA will they automatically be transported with the new queue. If what is the procedure to avoid the same.

Also what are the other precautions we need to consider when we schedule the automatic transports.

Thanks

ram