Well, I know this doesn't work........any help appreciated.
UPDATE CustomerExt SET FirstName2 =
(SELECT LTRIM(RIGHT(Customer.FirstName, LEN(Customer.FirstName)-(PATINDEX('%&%', Customer.FirstName))))
FROM Customer
LEFT JOIN CustomerExt ON Customer.ID = CustomerExt.ID
WHERE FirstName LIKE '%&%')
UPDATE CustomerExt SET FirstName2 =
(SELECT LTRIM(RIGHT(Customer.FirstName, LEN(Customer.FirstName)-(PATINDEX('%&%', Customer.FirstName))))
FROM Customer
LEFT JOIN CustomerExt ON Customer.ID = CustomerExt.ID
WHERE FirstName LIKE '%&%')