You could pass the path in as a parameter and use that in a Set Current Dir at the start of the project being called.
http://www.kinook.com/VisBuildPro/Ma...ameterstab.htm
http://www.kinook.com/VisBuildPro/Ma...rdiraction.htm
We'll also consider adding an explicit option for that in the VisBuildPro Project action.
Thanks.