I have turbocad 2015 designer
how to change the work area to meters or centimeters so i can work on the scale i want?
right now it is in inches
At the top of screen select Options > Space units > change English to Metric and then you can modify any the units to suit your requirements.
Once your setup is the way you want it, it would good to save that file as a Template. All your setting will be saved for next time.