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I have two exp. I want to combine
is there a way to copy part of one exp to the other exp?
Yes, but it's a bit indirect. You can go to the script editor (in the General properties tab) and copy the entire script from one experiment to another. You can also copy selected parts of the script, such as specific items.
You will find the copied items in the Unused items bin, and you can integrate them from there into your experiment.