I would like to know about obd codes p0056, p0060 and also how do I go by trying to get these fixed to pass smog

I am assuming this code started with the letter P (P1793). This code refers to the Transmission so the catalytic converter replacement will have no effect on this code. There is an issue with a signal from a sensor on the transmission. You will need to take this to a good mechanic as access to these sensors can be difficult to get to.

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Definition of P0420 is catalyst below threshold. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail.

P0447 Evaporative Emission Control System Vent Valve/Solenoid Circuit Open. The Powertrain Control Module (PCM) has detected an open within the circuit that controls the vent valve or solenoid for evaporative emission systems vapor.

Read more at: http://www.obd-codes.com/p0447
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OBD POO34

If the check engine light is on, you would need to get the trouble codes first. Not much the DIY can do without the equipment to check exhaust gas.

Find someone with "VAGcom" or VCDS cable and software.

here is an excellent source for obdII codes and information as to what might be the causes;

http://www.obd-codes.com/trouble_codes/

As you probably know by now there is no way to pass an emissions test as long as the check engine light is on....Your car is what they call an OBD2 system... You need to have the diagnostics codes pulled by a special tester specifically for OBD 2 systems... Once codes are pulled fix if necessary any problem and have the codes cleared... This will turn the check engine light off an enable you to pass smog providing your car is running properly...

1997 sable code is PO155

If P1627 is set when there is a problem with the fuel level sending unit, 100% sure on this problem, replace the fuel level sender in the gas tank, about 2.5 hours, very straight forward job