Where can I find information on how to design a part/subpart that can be imported to a schematic.
For example I use a common set of power regulator parts that allow auto switching between
line power and a battery. I would like to design this circuit one time and be able to import it
to new schematics. THX
are you talking module like sub circuitry that comes with a pre made layout attached to it?
The sub circuitry part is possible via hierarchical sheets.
Just create a schematic with your reuseable circuitry and save that in a basic-schematics folder.
If you need that incorporated into your project you just copy the schematic into your project folder and create a hierarchical sheet within the project with exactly the same file-name as the sheet you just copied.
When asked if you want to populate the new sheet with the contents of the one that is in the project folder answer with YES.
The layout part is not possible yet with KiCAD… afaik a lot of work (especially the refurbishment of EESchema) has to be done before the devs can even think of that kind of feature.