If your values of current and voltages are changing nonlinearly/changing with different intervals then, i don't think DC nested sweep analysis of Oscad would help you. And also pls share your example. we can try it out.
In analysis inserter there is option available for DC sweep.
Sir I had used DC sweep from 5V to 30V with an increment of 20V and similarly for current as secondary sweep variable and it is working fine. Thank you sir.