Use manual mapping when you want to have full control over how table is copied during conversion. Please note that once you use manual mapping for a table, settings here have precedence over options in Project options or Global settings.
You can edit target table name freely and we will not attempt to interfere with your choice even when you break rules for valid identifiers for target database. Manual mapping is for your total control. If you select existing database from the list, we will attempt to map all columns automatically to save you from specifying each and every columns. You are free to change each column as you like - its name, data type, precision, default value etc.
Use buttons in the top of the screen to de/select all columns at once, again, to save time when all you need is a few columns.
Change the way table is created and data is loaded. If you wish, you can also decide to skip index and foreign key creation.