Hello David, and welcome to Seven Forums.
For data (ex: music, pictures, documents, etc...), I would recommend to create a new folder on your 1TB HDD for each of them, include those folders to the appropriate library
, then change the library's default "save to" location
to be the folder on the 1TB HDD. This way anything you get to see all of the included folders of a library on one easy to use location, and anything you save into the library will actually be saved to the folder on the 1TB HDD.
As for programs, some will give you the option to do a custom install of them to be able to select where (ex: 1TB HDD) you would like to install them to.
Hope this helps,