You want to convert an automatic to a standard? Or you want to make a standard into an automatic?
Either way, its a chore. Computer has to be added and wired in to go to auto along with a reflash of the ECM or swap for an auto ECM. Computer delete to go to standard removing the TCM and jumping a few terminals on the ECM or again swapping in a standard ECM. Then you have the pedals, hydraulics, sensors have to be swapped on the engine and emission control systems.
People have done auto to standard. There are a few threads here. Google it.
Standard to Auto, that's where I thought you were going, would be easier to just buy an automatic car.