The only solution I've been able to come up with is this. Whatever the source of the logo, .eps, .jpg, and so on, save it as a BMP very large. I have a logo that has some complexity to it so I saved it at 40" wide as a BMP. Then Import it into Vectorworks, select Modify, Trace Bitmap... these steps create smooth lines that stay true to original logo. From that there I can select Modify, Combine Into Surface for each element/letter of the logo allowing me to Extrude. From there scale logo to size needed.