Hello aspirant,

In Karnataka NEET UG counseling, there is no option to lock the choices. When you have arranged your list of colleges you want to take admission in preference-wise, there is an option of "Save and submit". After that, you can take a printout of your choices. The provision to change option entry by eligible candidates (add/alter/rearrange/delete) will be available till 10 am of 3.2.22.

Hope it helps!