Transformation file issue?

Hi All,

We are using SAP BPC NW 10.1 classic.

I have to load following type of flat file.

Account   Entity  Rptcurrency  Category    2015.JAN  2015.FEB

4000000   XYZ     USD            ACTUAL    1000000    1500000

5000000   XYZ     USD            ACTUAL     2000000    250000

Total Dimensions in model: Account,Entity,Time,Rptcurrecny, Category, Time, Audittrail and Region.

My requirement is,

   1. no audittrail members are coming from flat file. We have to load each record in flat file to 2 audittrail members (Input, Calc)

   2. If the account member begins with '4' then i have to flip the sign

   3. no region members are coming from flat file. We are maintaining property in entity dimension which contains with respect to entity.                                We need to load region members based on entity dimension property.

Please let me know the possible solutions??

Thanks,

Naidu