Open a Dev/Quality to make config changes VS. Junk Transport until Quality

Hi Experts

Scenario : As a part of testing, we have to make config changes until Quality only.

Question : 1) Is it better to create a junk transport OR opening the Quality system to do config

changes?

2) Is there any way of clearing junk transports?

I would like to know which is the safest route to approach in this scenario.

Thanks for your response.

Sri