From the buildingtool context
you can select the "iterate" tool for the buildings.
Now just select a building and click left to iterate the saved definitions for the selected building. It will be updated in realtime (ok, it takes a second.....).
Select another building via context or via CTRL+Leftclick.
Iterate backwards via SHIFT + Leftclick.
This option lets you find the desired definition / style very quickly.
The last loaded definition becomes also the active definition for new buildings (building tool), so
creating further buildings or editing in the loaded style is very easy.
Note:
Floor-files will save the heights of buildings,
while
Building-files hold definitions for a certain building type.
