Can i use the uc application fee waiver again?

I used it for four applications during high school. Can I use it again now that I am transferring ?

You would have to qualify again.

Students can apply for a fee waiver within the online undergraduate admission application and be notified immediately whether they qualify.
Information about the family’s income and the number of people supported by that income is required to make a determination.

UC will waive application fees for up to four campuses for qualified students.
United States citizens, permanent residents, and applicants eligible for AB 540 BENEFITS may be eligible for the fee waiver program.

Students who have fee waivers from multiple sources (e.g., UC, College Board, ACT, NACAC) will be allowed to use one waiver only to apply to up to four campuses.
If a student wishes to apply to more than four campuses, they will be required to pay $70 for each additional campus.