To customize migration of MySQL table, double-click on the corresponding selected item on "Select Tables" wizard page. In the appeared dialog box specify table name, type and default value for any columns using "Field info" group of controls. Also it is possible to exclude columns from conversion result by unchecking the corresponding checkbox.
Note: listview on the left of "Edit Table" dialog window contains column attributes for the original MySQL table, new types and attributes will be displayed in "Field info" controls when the corresponding item is highlighted in the listview.