I had a co-worker show me how to do this, and its a very easy drag-and-drop solution.
1. From the Test Management tab, click on Test Library.
2. Click on the test you want to copy the test steps INTO
3. Click on the Steps tab
4. In the pane on the right-hand side of the screen choose the folder of the test case you want to copy the test steps FROM
5. You can use the optional filter, if needed.
6. Select the actual test that contains the test steps you want to copy FROM
7. Using your mouse, select the step sequences you want to copy, and drag them into the test step pane, releasing when the icon changes from a red-strike-circle to a green checkbox
Done!
