Comet Promise Questions, Does It take from grants?

So, I accepted my offer to UTD. Paid the housing fee and everything. Family income is <30k. I applied before the deadline and I believe I fit all the requirements for the comet promise. However, I heard that once you start your semester, they use your grants and scholarship money to pay your tuition? I don't know if that's true or not but I was planning to use my scholarship money to pay for my dorms...

For instance, I currently have $16k in scholarships + grants for one year at UTD. If my tuition is covered, will that take away from my scholarships and grants? Or do I get to keep that $16k, and the university just covers my tuition?