The image below shows how I’ve done this for an open motherboard project within my Altium 365 Workspace in my web browser. Altium Designer will bring the associated component symbols, footprints, and parameters into the new project automatically.
PCB design tools already allow users to open old designs and start modifying them, but the best software platforms like Altium Designer allow you to enforce a structure to your old design documents that is ideal for PCB design reuse. It’s all about making sure the knowledge you’ve gained from building great products can be adapted to new designs without constantly rebuilding the wheel. PCB design reuse practices are great for cutting down design time and ensuring all your products live up to the same level of quality. Isaac Newton once said "If I have seen further it is by standing on the shoulders of Giants." Not all designs need to be remade from scratch, and if you organize your designs properly you can easily reuse your old design data in a new project.