The answer in citrus trees would be YES. The only thing that makes the plant dwarf is the rootstock. Cuttings taken from the grafted portion would return to their original state of full size citrus.

That's kind of what I'm hoping. In my area it is hard to find a 'pure' Walter's Viburnum, not impossible, just difficult. I do, however, have three dwarfed Walter's 'Whorled Class' Viburnums, one of which I am sure has been grafted. I'm hoping that if I take cuttings from these that the resulting plants would be more akin to the 12-15 ft varieties than the 4 ft mounds they are expected to grow into. But seeing as I have only a little idea on how grafted plants work, I wanted to get some insight before I spent years nursing on cuttings only to find they are still dwarfed.

All influence of the original rootstock will be completely lost when you propagate a cutting from a grafted scion.

Cool, thank you. I will have to try and get some cuttings rooted and hopefully in 4 years or so I will have 'true' Walter's Viburnums. Yes I can probably get one from a plant sale between now and then (and I probably will), but it will be a 'fun' thing to do.