I am working on a project where a series of modules are hotlinked into each other i.e. a hot water tank module is linked into an apartment module, which is linked into a building drawing, which is in turn linked into a site plan. If I change the dimensions of the hot water tank (at the bottom of the stack) it seems that I need to update all of the modules above it one at a time. What I want to do is open the site plan or building plan and have all of the hotwater tanks automatically update as would happen if I used a series of nested x refs in AutoCAD. Any ideas?