Is that possible? I tried doing it using the admin GUI. When I add the attribute it dissapears from the available attributes, as usual, but if I move it inside the groups on the attribute set there is no option of "copying" or alike.
I realized of this issue as programmatically we are importing products, categories and attributes. On the language attributes we have for example german. It is used in several places, for manual language, for titles, descriptions, etc. We didn't knew about it and just realized when detected that the attribute is only found on the last created group where it was placed.
If it is not possible then how do we solve this issue? Should we create several different attributes to be used on different groups inside an attribute set? Maybe german_manual, geman_language or something similar? Or there is already a solution for this and we do now know it?
Hope I have clearly described my question, is somewhat complicated.