I’m brand new to zbrush and want to take this headstone from sketchup and sculpt the sides to look like rough broken rock. Importing from sketchup and dividing obviously doesn’t work. How do I go about making this monument in zbrush? Any tips or tricks would be greatly appreciated.
… and making a chamfered edge like this one:
ZModeler would be perfect for that.
Dividing might not work, but if you can import the model from sketchup then dynameshing should give you a similar looking shape which you can then divide and sculpt on.
I missed the Sketchup part in your initial post. Dynamesh would be a good start as Cyrid suggests. Then you would have several options to make it look lke rock. The Noise tab would give you some quick options, or bringing in stne or rock Alphas.