How does your company manage hardware reuse?
Some EDA tools like the one I use, Altium Designer, provide methods to save varying portions of circuits to make them somewhat portable.  For small circuits, you can use "Snippets", or for larger, multi-sheet reuse, "Device Sheets"

I don't know of any standard for hardware schematics (SPICE is too abstract; to my knowledge you can't tie it in with footprints, your part numbers, suppliers, their part numbers...) so any sort of reuse would be highly dependent the EDA package your company uses and the features it provides, or the organizational methods you implement surrounding it.