PCR by designing primers of the dCas9 and target vector RE sites

or

Cut the dCas9 region from previous vector, repair the ends and ligate to new vector. But you have to care about in-frame codon.

https://www.researchgate.net/post/Is_it_possible_to_transfer_your_construct_of_interest_from_a_plasmid_to_another_one

following

As Golzar Hossain answered, you can do PCR or subcloning into a new vector. For subcloning you need to check the vector maps of the addgene vector and the new vector you want to design in order to use the proper restriction enzymes.