In the interface for creating a new survey, there is an 'Import text' option, which allows you to import the text of questions and answers from e.g. Word into 1KA. More detailed instructions are available in the manual.
If you want to transfer a questionnaire from your own 1KA installation, a virtual 1KA domain, or 1KA.arnes.si to the 1KA website or vice versa, you can export and download the questionnaire to your computer in the 'ARCHIVE' tab, and transfer it via the interface for creating a new survey to any 1KA installation. More information on transferring 1KA questionnaires between domains is available here.