I constructed a down counting circuit using 74LS192 which counts from 9-0 and resets at 10. I want to cascade another 74LS192 which should count from 5-0 and resets at 6. How do I make the second IC downcount?

 

Do you understand how your circuit that counts down from 9 to 0 manages to reset when it hit 10?

Why isn't the logic for each digit the same?

 

I constructed a down counting circuit using 74LS192 which counts from 9-0 and resets at 10.

Your schematic would be easier to read if you printed to black and white PDF. And removed the unnecessary wire jogs.

What does the existing circuit do?