Thanks for reaching out to us, I have answered this question as well in your other post. I think you are talking about move from Studio classc to Designer, please refer to below document:
Basically yes for your other thread, you need to rebuild the whole pipeline since we can not copy - paste your orignal structure to Designer.
I am sorry for the inconveniences since the new studio has a disfferent structure to make this migration not that easy. Please let me know if you have any question during this process, we will provide help.
-Please kindly accept the answer if you feel helpful to support the community, thanks a lot.