What is the process of adding plan data to an existing data source?
You have two options.
1. If you're using workbench to load your data into Domo, you can also add the plan data at the end of your existing dataset as new fields. I would add them at the end not to mess with the column order of the existing fields.
2. Or you can add the plan data as a separate datasource. Then use dataflows (Magic ETL) to merge the two datasets into one. Make sure you have a field in both datasets to join on (i.e. Date field, etc).
@lene, did Godzilla's response help answer your question?