Yes, there is a way to randomly select a cell from an array in Excel. Here's how you can do it:

1. First, you need to determine the range of cells that you want to select from. In your case, it would be the range of ticket numbers.
2. Next, you need to use the RAND function to generate a random number between 0 and 1. You can do this by typing "=RAND()" into any cell.
3. Now, you need to use the INDEX function to select a random cell from your range of ticket numbers. The INDEX function takes two arguments: the range of cells you want to select from, and the row number of the cell you want to select. To select a random row number, you can multiply the result of the RAND function by the total number of rows in your range, and then round down to the nearest integer. The formula would look something like this: "=INDEX(A1:A10,INT(RAND()*10)+1)".
4. Finally, you can copy and paste the formula into another cell to generate a new random ticket number each time you recalculate the sheet.

That's it! With this method, you can easily select a random cell from any range of cells in Excel.