Sencha Architect allows you to import projects easily. However, the program requires the project to be archived as .xds or .xda. How do I do that for the default projects like KitchenSink, Kiva, etc.?
Thiem is correct, the well know kitchen sink demo is not an architect project so it can not be imported. However there are several demo projects both for Ext.js and Touch. You can grab them at Sencha Architect repository on Github. More information on Example Projects can be found in the Sencha Architect documentation.
I hope this helps.