OP, even though you can't duplicate a sheet per se, there are some ways to make almost a duplicate easier. Here's a few:
1. Create a Guide Grid on a sheet and give it a name, crop it to just one crosshair and place it where you might want the intersection of grid A-1 for example. You can turn it on and off on every sheet, and it makes it possible to position level 1 on one sheet in the exact same place as level 2 on another sheet.
2. If there is a detail you want to place on more than one sheet, make it as a legend. You can place the same legend on many sheets. You could use another guide grid to help align these quickly.
3. Text objects will copy from one sheet to another, and you can place them on multiple sheets at the same time without opening those sheets.
If by some odd chance my nattering was useful -- that's great, glad to help. But if it actually solved your issue, then please mark my solution as accepted 🙂