Re: How to map 2 fields from source to 1 field in target object?
SFM Mappings are limited to a one-to-one relationship from a source field to a target field. However, I have solution that will allow you to do this.
1. Create a custom (long) text field on the Case object.
2. Create a workflow rule on the Case object to execute on create and update. Add a field update to the workflow rule to concatenate the subject and description fields and update the text field (created in step 1).
3. Map the text field (created in step 1) to the Internal Notes field in the SFM mapping of your SFM.