HI AAron, I branched your discussion from the previous one, since this was a new question.
If it is file based data - you can use the Quick Data Load interface - and select Add Data - this will allow you to navigate to the folder where the file based data sits and allow you to bring it in. If there are any common field names that are linked to the other data - they will be linked automatically. If they are the same data, but named differently - make sure to rename the column in the additional data set to match the appropriate field you wish to link on.
If it is not file data and perhaps database or other data, you can use the data load editor and create a new script tab and a new connection to the appropriate data source.
These videos will help:
Hope this is helpful.
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