BPC NW 7.5 : Change dimension member from upload

Hi All.

Is possible change the value of a specific size starting from a value of another dimension into conversion file during upload from infoprovider?

Example : I want upload data from DSO , and , from a specific ACCOUNT I'd like change the value of dimension FLOW

ACCOUNT SOURCE FLOW SOURCE ACCOUNT TARGET FLOW TARGET

BS_000000001 BS_FLOW_D -

>> BS_000000001 BS_DUMMY

There are some method in CONVERSION FILE like a formula or other way?

Thanks

Marco