yes, you can. here's: how to sample on OP–Z.
the latest os update for the OP-Z is available for download here. it includes sampling functionality and lets you sample directly to your OP-Z from a microphone, headset or over usb. with usb you can send digital audio to your OP-Z for sampling and receive digital audio from your OP-Z for easy recording.
alternatively you can use the OP-1 drum utility and record the samples to your computer, then use the audio files to create a sampler patch which can then be imported to your OP-Z. OP–Z features full support for the OP-1 sample format (pitch, gain, playmode and play direction).