In reply to Juan V..

To answer you questions:
- Yes, if you assign a libname by code then it should be available immediately in the SAS interface to Excel.
- Data manipulation tasks? Yes, many of those tasks are available under the SAS tasks menus. The SAS Add-In does not have the full-blown Query Builder like EG, but many of the other tasks (like Rank, Standardize, Transpose, etc.) are available.
- You can update SAS data from Excel. When viewing a SAS table, you'll see a "Begin Edit" button on the top of the screen (well, it will look different in Spanish). Click it to enter "edit mode" -- then click again to commit the changes and write them back to SAS.