Create an addition to the Batch Editor plug-in

Now the plug-in is that you cant add attributes to your existing list, you can only replace the values with new ones.
This is not practical for products that already contain some value.

You need to refine the plug-in to be able to ADD value to existing lists.

Version 3.0.2.0 (trs-3.0.2.0)
No prepayments.