What is the difference between save and lock in CSAB choice filling?

Yes, you can move up, move down, swap, or rearrange choices before locking in CSAB counselling choice filling.

Yes, you can delete individual or multiple choices in CSAB, but before locking the choices.

No, CSAB choice filling is done for each round separately. You can fill the choice for the round you are registered in.

Yes, you can participate in the CSAB special rounds even after accepting a JoSAA seat in the NIT+ system, provided you follow the specific rules. 

No, you need to fill fresh choices for CSAB rounds. The choices filled in JoSAA will not be carried to the CSAB counselling.