Until July 2014, you needed the Free Excel Paste program (written by Mohammad R. Daoud, of Dynamics Innovations) to do this. Now Microsoft finally implemented this excellent functionality into Dynamics GP 2013 R2. It is so easy to do and is capable of pasting hundreds of transactions lines into GP GL in one click.
Here is how it works.
This function is excellent for pasting the bi-weekly Paychex or ADP entries. Much easier than trying to set up imports with either company.