Dogwood,
There is a special parameter transfer method for keeping the settings but changing the library part - as in your example from double hung to casement. The method suggested by SL_GDL will not do what you want.
If you are changing a particular double-hung window (e.g.)... select it, open the settings (ctrl/cmd-T) and then find the desired casement and locate it's image preview in the lower left of the settings dialog. Press the shortcut keys for the syringe (ctrl-opt / opt-cmd) and click on that preview thumbnail to inject the parameters of the selected window. Modify any parameters further, and OK out to change the selected window.
You'll find this works 80% or more. If you're not using any grids, it may work 100% - transferring the overall window/door size, frame sizes, sash parameters, trim, materials, etc. If you're using grids, the grids are per-sash, so if you go from a double hung to a single casement, you'll need to modify the resulting grid.
If you're not replacing an existing window, but instead trying to match it in another style, then eyedropper the existing window first before opening the settings dialog to syringe things into a new window for later placement.
Duh. Could have saved some typing if I had searched first... See this article:
http://helpcenter.graphisoft.com/guides/archicad-17-int-reference-guide/virtual-building/parametric-...
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB