You can submit any number of entries for the various categories. The registration fee of INR 5000 is applicable for each entry. If you are submitting a total of 10 entries, the registration fee is 10 X INR 5000 = INR 50,000+taxes
Do note that the entry fee of INR 5000 covers one project / work instead of 1 cateogry. Example in Best in Data Visualization if you submit 5 projects, you need to pay 5 separate fees.
The registration is online and material submission is also online. Once you complete the online registration, you will receive via email, the details for online uploading of your entries.