Hello:

From your comments I assume that you want to use the "Specific period" option (though I'm not certain that will put your invoices in the period you want - depends how you use it).

Adagio has dozens of free YouTube videos available. Most are in the range of 4 to 5 minutes.

Here is a video that will help: YouTube video on G:L Retrieval function

The entire video is just under 5 minutes and the part you want to see starts at 1 minute, 15 seconds.