In next generation communications, slicing enables the selection and allocation of network resources to suit the requirements of very different vertical-driven use cases and applications. This work addresses fast real-time resource slicing by proposing the novel concept of slicing at the physical layer. To implement such a concept an orthonormal transform is devised that splits the Orthogonal Frequency Division Multiplex (OFDM) symbol into slices with ranked rate and latency. The advantage over any carrier or time segmentation of the original frame is that the proposed technique does not require channel information at transmission. Also, the frame overhead improves, and the decoding time is kept simple.