A family of Microsoft relational database management systems designed for ease of use.
If you want to keep the dashes in the record in the table, but just display the acctno without dashes in a query (or a form or report), you can put a calculated field in the query by typing
NewAcctno: Replace([Acctno], "-", "")
Acctno 10100-67-123456-78 will be displayed as 101006712345678.
If you actually want to permanently remove the dashed from the field, keeping just the numbers, just use the same expression in an Update query.