Yes -- temporary macros override project macros. In the child project, reference the macro like %ABC%, and include a parameter Name ABC / Value %ABC% when calling the child project.
http://www.kinook.com/VisBuildPro/Ma...ecialchars.htm
http://www.kinook.com/VisBuildPro/Manual/macrostab.htm
http://www.kinook.com/VisBuildPro/Ma...ameterstab.htm