How to Import a Term Set File in SharePoint 2010
You can import your term sets instead of manually entering terms. SharePoint 2010 provides a sample import file that you can use to see how to import terms. To get the ImportTermSet.csv file:
Browse to the Term Store Management tool.
Click the View a Sample Import File link and then save the resulting file to your desktop.
The ImportTermSet.csv file downloads to your desktop. You can edit this file to create your own import term file.
Open the file in Excel or a text editor.
To import a term set file:
Click a term group in the hierarchy of your Term Store Management tool.
A term group is the highest level in your hierarchy. You can easily tell where you are in the hierarchy by clicking an item and viewing its properties in the right pane.
Click the arrow on the group and choose Import Term Set from the drop-down list.
Browse to the file you created in the preceding set of steps and click OK.
The terms are imported into the term set. Here is the term set included with the sample import file.