Export Transformation File

I am building an export file to load data into ECC and I need to provide the data in a specific format.

How can I do the following:

1.  Cost Center to ECC needs to be the combination of the BPC Cost Center and Company code.  For example, costcenter-companycode(6000-1000)

2. Conversion of Account and company codes to ECC equivalent.

Any assistance is greatly appreciated.