Currently, Vectorworks has a plugin to cove.tool that sends out areas to get a basic 2D model. Definitely ask your Vectorwoks rep about when they expect to have the 3d export to cove.tool.
The best way to get your 3d model imported to cove.tool from Vectorworks is to export to Rhino. For the basic manual mode 2d Export plugin from Vectorworks, see this article: http://help.covetool.com/en/articles/5063718-vectorworks-plugin-workflow
Follow this link to see how to export to Rhino: https://app-help.vectorworks.net/2016/eng/VW2016_Guide/ImportExport/Importing_and_Exporting_in_Rhino_3DM_Format.htm
How to export geometry from Rhino to cove.tool: http://help.covetool.com/en/articles/4230815-rhino-grasshopper-plugin-v-3-0-0-and-later-workflow-for-3d-mode-daylight-and-energy