Wix Code sharing

I have several independent projects all of them requiring a particular set of DLLs deployed in their respective install directory. Currently each project maintains its own deployment project and each respective wxs has the instructions on how to deploy this set of DLLs. As this set of DLLs is pretty large, requiring directory permissions, etc, how do I have a single shared file/location to be used when building any of these projects? (WXI only seems to do properties)

This seems to be a question related to Windows installer XML (WiX). Not the Code aspects of wix.com sites. Please try asking your question on Stackoverflow.