Hi Andy,
I do this all of the time. On the block diagram palette is the Waveform subpalette. The second icon is the build waveform vi. This has three elements, to, dt, and y. The to is the initial time (typically zero), the dt is the delta time in your waveform and the y is where you wire up you old array data to. The output is a waveform datatype.
Regards,
Marc