Importing a data folder into a data set folder

How to import data from an external data folder into a TestArchitect data set folder.

At times, rather than import a single tab-delimited text file to a data set, you may have a full set of external files that need to be imported as data sets.
Note: TestArchitect supports the import of two file types, .csv and .txt, into data sets. These files must contain tab-delimited text lines.