Gareth is right, you can copy and paste from Excel. However, if you want the data to be pulled live from Excel then you want the Data Merge feature. There are two videos on youtube:
1. Arbortext Monster Garage https://www.youtube.com/watch?v=fBBFEpo5prk
2. Arbortext User Group https://www.youtube.com/watch?v=NLlRvzhYDjg