import from file / table advanced logic

Hi Gurus,

I am new to MS

I would, in an upload from csv and/or sql table, apply the following logic

If Account 1000 property Market = X, then Entiy A

If Account 1000 property Market = Y, then Entity B

Could you pls advice me in best practice and step by step?

Should I use transformation file, conversion file, script logic or perhaps something else?

If this would be NW I would just use ABAP... but now it is MS

thanks for your input

best regards

Mike