Is manually shifting an automatic bad

is it ok to manually shift an automatic transmission
can you switch to manual mode while drivingcan i shift my automatic transmission from d to 3, 2 or 1 without stopping the car?
cars that are automatic and manual
why do i have to manually shift my automatic transmission
does driving an automatic car in manual save gas
is it bad to shift an automatic transmission while moving
how to manually shift an automatic

Yes, in certain circumstances. Using an auto in manual mode on long steep hills for engine breaking can overheat the transmission.