Transfer of the carbamoyl moiety of carbamoyl phosphate to ornithine is catalysed by a liver mitochondrial enzyme:
The carbamoyl group is transferred to the NH2 group of ornithine by ornithine transcarbamoylase (OTC).
Reference: Vasudevan 7th  ed, pg 204
Carbamoyl phosphate synthetase
Ornithine transcarbamoylase
N-acetyl glutamate synthetase
N-acetyl glutamate hydrolase