Yes, management quota at DDU does exist and is used when y ou’re ready to pay higher tuition fees (often 1.5–2.5 lakh/year)

You apply directly to the college (after ACPC rounds end or through institute-level rounds)

With 86.6 percentile in JEE, you have a fair chance to get CSE through management quota, especially if:

You apply early

Seats remain after merit-based admissions

You're ready for the higher fee structure

I suggest you to  contact college admission office directly and inquire about fee structure deadline documents needed.