Dear aspirant,

As per my understanding of your query, I suppose you're asking if you can change your course and college during admissions. If this is the case, then you can change these numerous times. Suppose you have already taken admission in any one of the colleges in University of Delhi after the first cutoff. If you're getting a better college and course after the release of the subsequent cutoffs, you can cancel your admission in the first college, and then apply to your desired college.
If this is not the answer you were looking for, I request you to further clarify your query.

Hope this helps!