[wjbrewer]

If there are single fields in a table use a SQL statement like this

ALTER TABLE xcart_tablename DROP fieldname;
(replace xcart_tablename with the name of the table, and cellname with the name of the field)

If it is a full table use this

DROP TABLE tablename;

Enter the SQL queries in the Patch/Upgrade section...and don't forget to backup your database, in case there are any problems.