Dear Tirtha Jana,

Here is the procedure, one can only book 6 tickets per login id, as you are looking for 20 tickets, you need to create 3 more login IDs

6+ 6 + 6 + 2, which means you need 4 login IDs. While creating login IDs at ttdsevaonline, you need to provide unique mobile number for each login ID.

Rest all is simple process. Please let me know if you need further inputs on this.

Thanks,