Hi, I am currently trying to exploit datas from gearscape thanks to ggl2. Therefore, I created a table (id, point, length1, length2) in gearscape. I have imported these datas into ggl2. As an example, I would like to add new attributes for each element, such as the average ratio length2/length1 that I will calculate with ggl2. I have concidered defining a new element that I would have joined with the one from gearscape. But this imply having a join condition that doesn't exist since all the attributes are different. Is there a way to add new attributes to a structure imported from gearscape to ggl2 ? Thank you for your help, Best regard. Guillaume