Great tip @Bastien_Siebman! Thanks for sharing! We also have a similar use case for a project that we use as a reporting tracker. We multihomed the reporting milestones from our 3 templates into the reporting project that serves as our rolled-up view. Now, anytime a project is created, the reporting milestones are also multi-homed into our reporting project. This was our solution for a small scale milestone view. Will definitely give your tip a try for larger lifts.