@yosef-ymj Hi. I suggest you learn to use Edit -> Column Editor (Alt+c) to insert a column of ascending numbers.
Then, learn to use Alt+MouseMovement to select rectangles, and gain skill with rectangular cut/copy/paste operations.
When working with rectangles, these are also helpful:
Shift+Alt+ArrowKey to adjust dimension Shift+Alt+LeftMouseClick to specify opposite corner of a rectangle whose other corner is current caret positionIf your data is as uniform as shown, a sequence using the above operations will do what you want, although you may need to handle 1, 2 and 3 digit sections separately.
To review some creative solutions to rectangular text problems, use the magnifier icon and search this site for terms like “column editor rectangle paste”.
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