[Koha] On export existing isis-catalog to the Koha environment

Hello Koha-community ! I have the following problem. The library e-catalog of our Institute is located on the library computer (OS Windows XP). This catalog has been created by means of the program "CDS/ISIS for Windows". I would like to test a package Koha. For this purpose our administrator has downloaded the Koha-2pi on the server of our Institute (other computer, OS Linux Fedora). Using Intranet, I can see and test this Koha-package on the library computer, but I don't know how to export the mentioned catalog in the environment of Koha. Please, help me. Thank you. Gennady Zolotenko, Institute of Mathematics, National Academy of Sciences of Ukraine, Kiev