If the Funds are determined by one specific field, you can do the following:

1) assign the field that determines which Fund should be used in the Source Field.
If the data in your Source matches your Funds in RE exactly, then you may not need to proceed through the remaining steps.  If it does not, then you will need to use Data Transformations.


2) Click on the red radio button at the end of the row for Fund (this opens the Field Settings which is where you can access Data Transformations).
3) Map the transformations that you need in the box at the bottom of the screen (you can watch a video about these transformations here):