You cannot delete vendors in BQE CORE if they have historical transactions, as this data must remain intact for reporting and audit purposes. However, you can prevent vendors from appearing in the Expense Entries screen and related drop-downs by changing their status.
To do this, open the Vendors screen and set the vendor’s Status to Inactive. Inactive vendors no longer appear in drop-down lists, but all historical records associated with them remain available in CORE. Check CORE Help for details.