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    Is it a deliberate choice to display multiplicities (x1), but then not to merge the two subsequent executions of Item 3 into one execution with x2? Commented Nov 25, 2023 at 10:58
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    According to the comments after the question, the OP needs to select the added items independently to edit them Commented Nov 25, 2023 at 19:18
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    This, but also add drag-and-drop. Commented Nov 26, 2023 at 0:51
  • This is definitely one of the best options, thank you. I had thought of something similar with a '+' button instead of the 'add' button. The only doubt I have remaining is a UI-related question, specifically how to enhance it graphically to have a style similar to this project. That has a style similar to mine. However, I'll have to handle this on my own. Any suggestions are always welcome. Commented Nov 27, 2023 at 6:21
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    Instead of having all items visibile with it owns Add/+ button. you could just have a single Add/+/New button at top of the right list, which opens a dropdown where you can select which item you want to add. Commented Nov 27, 2023 at 9:25