Data Type Conversion while Loading Data - using Control file (CTL)

Hello Community,

I am trying to load 50 million, 10 Tables in SAP HANA Box using CTL files. I am running into issue when it comes to Data Type conversion while loading the data into SAP HANA box.

Please guide me on how to achieve the following:-

1. Is it possible to do Data Type conversion while loading Data - Using Control File. If yes How it can be done ?
2. My requirements is to Convert (to_Decimal) while data load happen for 5 fields.

Awaiting quick response.

Regards

Kumar