Summing rows with condition

[Accounts_Accoun]

I would like to create a formula that will:

Sum the {Amt} fields only from records that have the identical data in another field {ticket/voucher #}.

For example:
Records 1, 7 and 14 have the identical data in {Ticket/Voucher #}. The formula would sum the amounts only from those records
1717.40

• 980.00
• 250.00
  and put the total 487.40 in {Formula field}.

The same would go for records 10, 12 and 15
and 11, 16 and 13.
See link to image of my table.

https://hctny-my.sharepoint.com/:i:/g/personal/office_highclasstravel_com/EesBZqFYxQpIvxnKzbAVLu8Bs6...