At first sight it seems that the new Multistorey tools in Revit look like a significant improvement over the old method. However, as you delve deeper, there are some new problems that have been introduced with the new feature.
Weirdness #1
Once a regular component stair has been converted to multistorey that process cannot be reversed. There is no command to ‘Reset Stair’ or ‘Convert back to single storey’. You can go to the ‘Disconnect Levels’ command, and select the other levels – this reverts it to a ‘Single Storey Multistorey stair’ – but it still identifies as a multistorey stair in the properties
So what, you might think? Well, you can manipulate a multistorey stair by tab-selecting the stair inside the ‘multistorey group’, but that could be very confusing. The more significant issue is what it does to railing supports:
Weirdness #2 Railing Supports
If you have a stair that has railing supports, and then you convert the stair to Multistorey it does something…