[Koha] Import records with number of items

Dear sir/madam I have installed Koha version 17.05 in Ubuntu 16.04 through package method. I have records with number of items in excel format. so i want to import records with items at a time, can any one inform how to achieve this. hoping for the kind solution from the Koha community Thanking you, -- Best regards Dr. Shankar Reddy Kolle Deputy Librarian Prof. Ram Dayal Munda Central Library Indira Gandhi National Tribal University, Lalpur, Amarkantak, Anuppur Dist, Madhya Pradesh -484887, India Phone No 09742749018