After generating the tickets, you could refine the ticket set based on your desired numbers.
Select a method by sliding left and right
Add new tickets, delete existing tickets
After clicking on Refine Tickets you will see a dialog as follows
You can strat typing new numbers for a new manual ticket. This first row is always the new ticket. By clicking on an item in the first row, the number will be deleted.
You can delete a ticket completely by clicking on delete icon next to the row
Click on "Analyze tickets" to reload the analysis with new set